Neurology and Psychiatric Drugs Flashcards

1
Q

Name the centrally acting skeletal muscle relaxants

A

Diazepam (Benzodiazepene)
Tizanidine (α2 agonist)
Baclofen

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2
Q

Diazepam

A

-Benzodiazepine (“long tapering flag”)

  • increase frequency of oppening of the chloride ion channel
  • binds at allosteric site on GABA-A receptor which is a chloride channel and potentiates GABA effects →Cl- influx →hyperpolarization→less neuronal excitation
  • indicated for spasticity induced by neurological disorders (e.g. MS)
  • produces sedation at required dose for reduction of muscle tone
  • can induce withdrawl affects
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3
Q

Tizanidine

A

-α2 agonist

  • inhibits release of excitatory Amino acids thus re-inforcing both pre/postsynaptic inhibition in the spinal cord
  • indicated for spasticity induced by neurological disorders (e.g. MS)
  • produces sedation at required dose for reduction of muscle tone
  • can induce withdrawl affects
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5
Q

Dantrolene

A
  • block RYR1 receptor → decreasing free intracellular calcium concentration.
  • treats malignant hyperthermia which is a condition resulting from defective RYR receptors in the Sarcoplasmic reticulum
  • useful for spinal injuries ,spasm after stroke
  • may cause severe liver toxicity
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6
Q

Botulinum toxin

A
  • exotoxin of clostridium botulinium
  • controls release of Ach from vesicles by binding to synaptobrevin
  • treats ophthalmic / local muscle spasms
  • local facial injection are used for treatment of wrinkles
  • present on honey - shouldn’t be given to children < 1 y.o.
  • may cause flaccid paralysis
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8
Q

Baclofen

A
  • GABA-B agonist
  • GABA-B receptor is a K+ channel →increase K+ influx →hyperpolarization →Ca+2 ion influx decrease → decrease release of excitatory NTs
  • rapid ,complete absorbtion after oral adminstration
  • used for spasticity induced by neurological disorder (e.g. MS)
  • less sedative but also less effective than Diazepam
  • enhances sedative/resp dep. effects of opiates
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9
Q

Non depolarizing muscular relaxant

A
  • competitive antagonists preventing Ach to depolarize the muscle cells
  • at higher doses they produce more intense motor blockade

1st -muscles of face,eyes
2nd -finger,limbs neck trunk
3rd-intercoastals , diaphragm

  • useful for anesthesia and facilitation of intubation
  • can be reversed by **Neostigmine

Isoquinolone dervatives -**

  • Tubocurarine
  • Atra-curium
  • Cistra-curium

Steroid dervatives -can be reversed by Neostigmine
-Pan-curonium

-Ro-curonium

*have vagolytic effect +enhance NE release

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10
Q

Depolarizing muscle relaxant

A
  • depolarize muscle cells similarly to Ach however they are more resistant to degradation by AChE therefore n-AChR is incapable of transmitting further impulses because of the resistance to depolarization
  • can lead to flaccid paralysis
  • During phase I the reaction is irreversible
  • useful for rapid endotracheal intubation or during electroconvulsive shock
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11
Q

how are benzodiazepens classified ?
name Benzodiazepens for each category
(“Ben’s Diner”)

A

-have “PAM-suffix
(“Pam-cakes in Ben’s diner”)

-have “OLAM-suffix”
(“pamcakes offered ALL A.M.”)
——————————————————————————–
Short acting Benzodiazepens -“ATOM”

Triaz-olam
Oxaze-pam (“fast ox”)
Midaz-olam
——————————————————————————–
Intermediate acting Benzodiazpenes “lora the clown”
Loraze-pam
Alpraz-olam
Clonaze-pam
——————————————————————————–
Long acting Benzodiazpenes
Diaze-pam
Fluraze-pam

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12
Q

Benzodiazpenes MOA

(“Ben’s Diner”)

A

-bind to an allosteric site on GABA-A Receptor
(“Ben’s diner coworker handing the Cab-A driver Pamcakes”)

-GABA-A receptor is a chloride channel, chloride influx hyperpolarizes nerve cells
(“chlo-rider” sign on Cab-A)

-Benzodiazpenes increase the Frequency of opening of the chloride channel
(ben’s diner is :”now open more frequently”)

-potentiates (enhance) transmission of GABA in CNS
(“Red CNS light on Cab-A”)

-GABA is the major inhibitory neurotransmitter in the CNS (the sign on Cab-A says “take it easy” )

-metabolized by the liver and produce long acting active metabolites
(“fast ox has liver spot on him”)

-have addictive potential
(“Ben’s Diner pamcakes have addictive flavour”)

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13
Q

what are Benzodiazepens used for ?

(“Ben’s Diner”)

A

-IV adminstration of Benzodizapenes are useful in managment of alcohol withdrawl , seizures , anesthesia (“Ivy on pole”)

-IV adminstration of Benzos can be used for general anesthesia
(“green shirt sedated customer with straw in mouth”)

-IV adminstration of Benzos is useful to induce
conscious sedation for minor procedures ,e.g.-colonoscopy
(cup saying “lite” infront of sedated customer)
——————————————————————————–
-useful for treatment of status epilepticus
(“coworker unplugging jackhammer”)

  • can treat insomnia (“customer sleeping on table”)
  • **not 1st line due to physical dependence**

-can treat Parasomnias in children
(“crying kid in pajamas”)

-benzos are muscle relaxants used to treat Spasticity cause by upper motor neuron disorders
(“red shirt blacky relaxed on diner’s bench”)

  • useful in treatment of General Anxiety Disorder {G.A.D}
  • *SSRIs/SNRIs are 1st line

(“Anxious cutsomer not sure if he can pay for the date lool”)

  • Benzos are useful for treating Panic disorder
  • *SSRIs/SNRIs are 1st line
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14
Q

Benzodiazepens side effects

A

-can potentially cause addiction
(pam-cakes have “addictive flavour”)

-can cause tolerance (“all are welcome” sign in Ben’s Diner)

-Benzodiazepens can cause Anterograde Amnesia and learning impairment
(“question mark hat on sedated customers head”)

  • useful for conscious sedation so patient will follow orders but will forget unpleasant procedure afterwards
  • Benzos can cause Central Ataxia causing elderly patient to fall

(“unbalanced stack of pamcakes infront of old fart”)

-elderly patients are more sensitive for Benzos side effects (“disoriented man sitting infront of stack of unbalanced pamcakes”)

  • adminstration of Benzos should be avoided with other CNS depressants such as 1st generation antihistamines
    (“coworker with bee swatter smacks old fart customer”)
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16
Q

what are the alcohol withdrawal symptoms

? what role do Benzos have in treating alcohol withdrawal

A

-alcohol also binds GABA-A receptor but on a different allosteric site
(“alcoholic guy is on back of Cab-A”)

-Benzos are useful in treatment of alcohol withrdawl symptoms (“hangover special pamcakes”)

  • especially long acting Benzos such as Diazepam and Chlordiazepoxide
    (“Long tapering flag on hangover special pamcakes”)
  • ​for patients with hepatic insufficiency use short-acting Benzos

Alcohol Withdrawal symptoms -“3 alcohol specialists”

1st specialist (8-12 hours) - insomnia ,tremulousness , anxiety , autonomic instability

2nd specialist (12-48 hours) - Seizures

_3rd specialist (_48-96 hours)-**delirium tremens** 
(fever ,disorientation , severe agitation )
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17
Q

what is the key difference between Benzodiazepens and Barbiturates

A

-the difference between them is that Barbiturates bind different allosteric site on GABA-A receptors

(“barber shop located on other side of Cab-A”)

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18
Q

How can you reverse Benzodiazepens-induced sedation

A

-Flumazenil is a competitive antagonist at the BZD receptor and can reverse Benzos-induced sedation

(“violent-antagonizing fluffy muzzled dog”)

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19
Q

Name the non-Benzodiazepine hypnotics

(“catching some Z’s”)

A

the 3 Z’s

Zolpidem
Zaleplon
esZopiclone

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20
Q

non-Benzodiazepine hypnotics MOA

A

-bind same allosteric site as Benzodiazepines at GABA-A receptor
(“ben’s diner coworker and zzz mattresses coworker are grabbing the same Cab-A handle”)

-GABA-A receptor is a chloride channel,chloride influx hyperpolarizesnerve cells
(“chlo-rider” sign on Cab-A)

-potentiates (enhance) transmission of GABA in CNS
(“Red CNS light on Cab-A”)

-GABA is the major inhibitory neurotransmitter in the CNS (the sign on Cab-A says “take it easy” )

-Barbiturates bind different allosteric site on GABA-A receptors
(“barber shop located on other side of Cab-A”)

-alcohol also binds GABA-A receptor but on a different allosteric site
(“alcoholic guy is on back of Cab-A”)

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21
Q

Pharmakokinetics of Zolpidem Zaleplon es-Zopiclone

A

-Zolpidem and Zaleplon are fast acting non-Benzos with rapid onset (sheeps sign says :”fall asleep FAST”)

-Non-benzos hypnotics have short duration of action
(“sheeps quick jump and fall on sign”)

-Zolpidem and Zaleplon are metabolised by the liver
(“sheeps on sign have liver spot on them”)

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23
Q

Side effects on non-Benzos

A

-elderly are more sensitive to the side effects

-can cause Central Ataxia
(“unbalanced stack of pillows”)

-avoid use with other CNS depressants
(“cannot combine with other CoupoNS”)

  • e.g.- 1st Gen. Antihistamines
    (“bee swatter coworker hitting old fart”)
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24
Q

what are non-Benzodiazepene hypnotics used for ?

A

-useful in treatment of insomnia

  • Zolpidem and Zaleplon are short-acting and therefore useful in treating Sleeep onset insomnia and not for maintaining sleep
  • esZopiclone has longest half life and is therefore effective for both falling asleep and maintaining sleep

​-less likely to cause withdrawal symptoms
(“sale sign says break those bad sleeping habits”)

-non-benzos are less likely to cause tolerance
(sale sign says “returns not tolerated”)

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26
Q

how can you reverse non-benzos sedation ?

A

Flumazenil - BZD Competitive antagonist
(“fluffy muzzled dog biting on zzz matresses red arrow sign”)

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27
Q

what other drugs can be used to treat insomnia ? MOA?

(“let your sleepless nights melt away”)

A
  • *Melatonin**
  • *Ramelteon/Agomelatin** (melatonin receptor agonists)

-MT1 and MT2 melatonin receptors are found in the suprachiasmatic nucleus of the hypothalamus and are activated by Ramelteon
(“nucleus above x shaped ceiling fan”)

  • **-Ramelteon has no direct effects on GABA-ergic transmission in the CNS **
  • melatonin receptors maintain the Circadian rythm (“light and dark spotlights”)

-Ramelteon/Melatonin have fewer side effects and are safer in Geriatric patients
(peacefully sleeping old fart below “melt-away sign”)

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28
Q

Name Barbiturates

A

Thiopental
(“The Ol’ quick shave”)
Primidone
(“Perm is done!” primadona)
Phenobarbital

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29
Q

Barbiturates MOA

A

-GABA-A receptor is a chloride channel,chloride influx hyperpolarizes nerve cells
(“chlo-rider” sign on Cab-A)

-potentiates (enhance) transmission of GABA in CNS
(“Red CNS light on Cab-A”)

-GABA is the major inhibitory neurotransmitter in the CNS (the sign on Cab-A says “take it easy” )

-binds to a separate allosteric site on GABA-A Receptor
(“barber opening dooe on other side of Cab-A driver Pamcakes”)

-Barbiturates increase the duration of opening of the GABA-A receptor chloride channel
(sign at entrance of shop saying :”long hair? now open longer”)

-Barbiturates have long duration of action and therefore “hangover” effects are more common
(“long tapering flag outside barber shop”)

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30
Barbiturates **Pharmacokinetics** | (mainly Thiopental here?)
-**Barbiturates** have **long duration of action** and therefore "hangover" effects are more common ("long tapering flag outside barber shop") - Thiopental has **rapid onset** and **short duration** of action because it's _highly lipid soluble_ - plasma levels of **_Thiopental_ decrease rapidly** due to **redistribution** to **skeletal muscle** and **adipose** ("barber cuts hair and redistributes it to arms and belly of customer") _Redistribution graphof Thiopental (on customer's chest_) **Decay line** - rapid decay of _plasma_ Thiopental **Brief peak -** rapid accumulation of thiopental in _brain_ and rapid redistribution **Growth line**-rapid accumulation of Thiopental in _skeletal muscle_ and _adipose_(recovery from anesthesia)
32
Barbiturates **side effects**
-chronic use of barbiturates leads to **tolerance** ("all are welcome" sign in entrance of barbershop) -chronic barbiturates use leads to **physical dependence** ("addicted to curls" sign) -can cause **hypotension** ("fainted old fart sitting on hair dryer chair") -can cause profound **cardiac and respiratory depression** ("old fart has collapsed heart and lungs t-shirt") -can cause **severe CNS depression** (coma) ,should be avoided in elderly ("brain shaped hair dryer") **-**barbiturates are **potent inducers** of the **CYP450** which may **increase metabolism** of drugs such as **warfarin** (activated chrome bumper plate saying "CYP450")
33
what are **Barbiturates used for ?**
**_IV-adminstration of Barbiturates_** _("Ivy on pole")_ **-IV adminstration** of **_Thiopental_** can be used for **induction of anestehsia** since its highly lipid soluble and enters the CNS quickly. (intubated customer getting "The Ol' quick shave") -**IV adminstration** of **_Phenobarbital_** can be used to treat **Seizures** ("coworker outside unplugging jackhammer") -**_Primidone_** ("perm is done!") can be used to treat **seizures** and **essential tremors -** 1st line with propanolol ("prima dona's barber has tremulous hand")
35
name the **IV Anesthetics** | ("Ivy on all damn poles")
**Propofol** (Introducing Prospero "fall asleep" the hypnotist) **Etomidate** (Introducing the beast from the east "THE INTIMIDATOR") **Ketamine** (Introducing "snaKE TAMINg" _nomad_ ) **Benzodiazepines** ("Ben's Diner") **Thiopental** ("The ol' quick shave")
36
**Propofol** | (prospero "fall asleep" the hypnotist)
-**potentiate** **chloride** current through the **GABA-A** receptor complex ("old Cab-A behind prospero's stand") -can be used for **induction** of anesthesia (introducing prospero "fall asleep" the hypnotist) -can be used for **maintenance** of anesthesia (sign next to prospero says :"try to MAINTAIN your sanity!") -propofol cause **profound vasodilation** (arterial+venous)
37
**Etomidate** | ("introducing the beast from the east the INTIMIDATOR")
-potentiates **chloride current** through the **GABA-A** receptor complex ("old Cab-A behind the INTIMIDATOR stand") -is an IV anesthetic for **induction** ("_introducing_ the intimidator") -Etomidate preserves **cardiovascular stability** ("the buffy intimidator stabilizes the patient ")
38
**Ketamine** ("snaKE TAMINg)
-**inhibits** the **NMDA recepto**r complex which is a glutamate receptor and ion channel ("hitched nomadic camel") -can be used for **induction** of anesthesia ("introducing the snaKE TAMINg nomad") -causes **"dissociative anesthesia"** ("man looking in snakes eye causing dissociative trance") -can cause unpleasant **emergence reactions** * vivid colorful dreams ("colorful steam from snakes bucket") * ​hallucinations * ​out of body experiences ​-can cause **cardiovascular stimulation{Incr.BP HR CO}** ("stimulated cobra's head shaped like heart")
42
**Benzodiazepines** ("Ben's Diner")
Midaz-olam , Loraze-pam -IV anestheic used **preoperatively** -used for **conscious sedation** for **minor procedures** such as **colonoscopy** ("bowel water pump outside Ben's Diner")
43
**Barbiturates** ("Barber's shop)
**-Thiopental** has **rapid onset** and **short duration** of action since it is **highly lipid soluble** ("The Ol' quick shave") -IV Anesthetic used for **induction** of anesthesia ("_Introducing_ the BARBER SWEENY PENTAL")
44
**Neurolept Analgesia**
**_Neuroleptanalgesia_** - a state of **analgesia ,sedation, muscle relaxation** BUT no loss of consciousness - **Fentanyl + Droperidol** - contraindicated in **parkinsonism** - useful during diagnositc procedures requiring cooperation of the patient **_Neuroleptanesthesia_** - Fentanyl+Dorperidol, **Nitrous oxide** - addition of NO **improves amnesia**
45
**Peri-operative** medications
_Before surgery_ -IV. Barbiturates - **Thiopental** ("the ol' quick shave") -Sedative/Anxiolytic Benzodiazepine -**Diazepam** ("long tapering flag") -Antimuscarinic - parasympatholytic agent -**Atropine("alice")** -Analgetics - **Opiods** (fentanyl) non opioids --------------------------------------------------------------------------------------------------- _During surgery_ -NMB- **Succinylcholine** (depolarizing) / **Curare derivatives** ( non-depolarizing) -Pressors in case of shock - **Norepinephrine** --------------------------------------------------------------------------------------------------- _After surgery_ -If opioids were used before surgery - **non-opioids** should be used -antagonism of NMB -**Neostigmine** -antagonism for opioids if respiration is too slow - **Naloxone**
46
Gaseous anesthetic
Nitrous Oxide (N2O)
47
Volatile anesthetics
Enflurane Isoflurane Halothane
48
Volatile anesthetics pharmacodynamics
-volatile anesthetics are **liquid at room temperature** (e.g. enflurane, isoflurane, halothane) ("Air tank in water") -volatile anesthetics are **fluorinated** (e.g. enflurane, isoflurane,halothane) ("Balloon flower") **-highly soluble** inhaled anesthetic (e.g. halothane) ("Moving freely in ball pit") **more soluble** inhaled anesthetics (e.g. halothane) have a **slower onset of action** ("Passed out later") -**more soluble** inhaled anesthetics (e.g. halothane) have a **longer duration of action** ("Long tapering flag") - Partition\>\>\>: higher blood:gas partition coefficient (e. g. halothane) → higher solubility → **slower onset of action - ---------------------------------------------------------------------------------** Less steep arterial tension curve (e.g. halothane) → higher blood:gas partition coefficient→higher solubility → **slower onset of action**
49
Nitrous Oxide Pharmacodynamics
**less soluble** inhaled anesthetic ("Impeded by ball pit") (e.g. N2O) less soluble inhaled anesthetics (e.g. N2O) have a **faster onset of action** ("Passed out earlier") less soluble inhaled anesthetics (e.g. N2O) have a **faster recovery** ("Immediate rescue" ) Steeper arterial tension curve (e.g. N2O)→ lower blood:gas partition coefficient→ **lower solubility → faster onset of action**
50
Volatile Anesthetics side effects
-inhaled anesthetics can cause **respiratory depression** (leading to decreased minute ventilation and hypercapni a) ("Deflating lung balloons") -**myocardial depression** →hypotension ("deflating heart balloon") -fluorinated anesthetics **increase cerebral blood flow** (decrease cerebral vascular resistance)("Red brain wig") halothane can be **hepatotoxic** (e.g. massive hepatic necrosis) ("Cracked liver") enflurance can be **nephrotoxic** ("Smacked in the flank") enflurance can induce **seizures** ("Shaking") **-malignant hyperthermia** (skeletal muscle hypersensitivity to volatile anesthetics) ("Magnificent birthday")
51
MAC
_minimum alveolar concentration (MAC)_ **MAC** corresponds to the **dose** of anesthetic that causes **50%** of patients to become **unresponsive to painful** stimuli ("1 out of 2 unresponsive") **1/MAC** corresponds to the **potency** of an inhaled anesthetic ​("Inverted bowl of potent mac and cheese")
53
what is the **treatment** of malignant hyperthermia
**Dantrolene -----------------------------------------------------------------------------------** Blocking Ryan: dantrolene **blocks ryanodine receptors** -treats malignant hyperthermia
57
**malignant hyperthermia**
-**succinylcholine** (depolarizing muscle relaxant) can also causes **malignant hyperthermia** malignant hyperthermia is related to a **defect in ryanodine receptors** (RyR) in the sarcoplasmic reticulum -excess **heat production** and consumption of ATP induces **rhabdomyolysis**
58
what is the **mechanism of action** of SSRIs ?
-**inhibit presynaptic reuptake** of Serotonin ("worker in sitcom keeps post-it stick notes out of the drawer")
59
name the **SSRIs** ("travel posters behind expre**SS tR**Ips")
_Selective Serotonin Re-uptake Inhibitors_ **Paroxetine** ("Parrot air" poster) **Fluoxetine** ("Fly out"poster) **Sertraline** ("Desert Airline" poster) **Citalopram** ("the City" poster)
60
MOA of **SNRIs**
-inhibit **presynaptic re-uptake** of **Norepinephrine** and **Serotonin** ("North and South compass poster above dual copy machine ")
61
Name the **SNRIs**
_SNRIs_ **-Venlafaxine** ("_fax_ machine infront of compass poster") -**Duloxetine** ("**_Dua_**l copy machine below compass poster")
62
what can SSRIs **_AND_** SNRIs be used for ?
- **1st line** treatment for **depression {M.D.D}** * \*slower onset than Benzos so not useful for treatment of acute symptoms \* -**1st line** treatment of **G.A.D** (Anxious coworker holding "preformance repot") -useful for treatment of **panic disorder** ("the scream saver") -useful for treatment of **PTSD** (coworker holding dog tags saying "PT" and SD") | ("happy/sad masks logo on right edge of sitcom")
63
what can **SSRIs specifically** be used for?
-useful in managment of **OCD** ("obsessively neat coworker re-arranging his table") **-** useful in treatment of **Bulimia** (blonde coworker opening "binge snack drawer") -useful in treatment of **Social Anxiety Disorder** ("shy coworker hiding behind desk ")
64
what can **SNRIs specifically** be used for?
-useful for treatment of **Diabetic Neuropathy** ("coworker feeling pain from Diasweeties machine") -useful in treatment of **chronic pain (neuropathic)** ("chronically frayed wires from diasweeties machine") -useful in treatment of **fibromyalgia** ("fiber bars at top shelf in diasweeties machine" )
65
how long should you wait before considering an alternative treatment for SSRIs/SNRIs ?
-SSRIs and SNRIs take **1-2 months** to achieve maximum effect | ("2 months calendar behind shy guy")
66
what are the **Side effects** of SSRIs ?
-hyponatremia as a result of **SIADH {incr. ADH}** ("inappropriately wet head of blacky coworker") -SSRIs can cause **Sexual Dysfunction** ("patty rejects and throws paper clips in ugly guy's face") -SSRIs can cause **weight gain** ("fat guy next to expreSS tRIps counter") -SSRIs can cause **Drowsiness** ("purple shirt coworker sleeping on the job")
67
what condition may percipitate as a result of SSRIs and SNRIs abuse ? what are the characterisitc findings of this condition ?
-SSRIs and SNRIs may cause **Serotonin Syndrome** ("excessive smiley post-it sticky notes in back office") -**combination** of SSRIs/SNRIs with other drugs may also cause **serotonin syndrome** {e.g. TCAs,MAOis} ("Tricycle and mouse traps in smiley backoffice") -serotonin syndrome is characterized by **hyperthermia** and **hypertension** ("michelle boss of the office is hot and has steam coming out of his ears") -characterized by **neuromuscular hyperactivity , hyperreflexia , clonus** ("boss of office hyperactive foot tap")
68
what is the **treatment** for Serotonin Syndrome ?
**Cyproheptadine** (5-HT2 blocker) (boss of the office holding sign saying "silly pranks prohibited")
69
what are the **side effects of SNRIs**?
-SNRIs can cause **hypertension** ("hypertensive coworker has steam coming out of his ears because of the fax machine")
70
what are the withdrawl symptoms observed after stopping adminstration of SSRIs/SNRIs ?
- withdrawl symptoms from SSRIs/SNRIs include **Flu-like symptoms** | (office phone has sticky note saying "out with the flu")
71
Name the **tertiary** Tricyclic Antidepressants
**Imipramine** ("**_Impr_**int on green shirt boy's face") **Amitriptyline** ("green shirt boy **_trip_**ping from tricycle") _secondary amines_ **Nortriptyline Desipramine**
72
Name the **Secondary amine TCAs**
_"**NOR**th si**DE** prep secondary school"_ **Nortriptyline** **Desipramine -** secondary amines have **less anticholinergic effects** (woman protected by "Northside prep" sign \*most appropiate for the elderly\*\*
73
what is the **MOA** of TCAs ?
TCAs **inhibit presynatpic uptake** of **serotonin** and **norepinephrine** NET/SERT ("green shirt boy prevented from picking up smiley and compass balls")
74
what can TCAs be used for ?
-useful in treatment of **resistant depression** ("happy/sad mask next to resistant door that kid can't open") -useful in **diabetic neuropathy** ("kid having pain from diasweeties machine") -useful in treatment of **chronic pain (neuropathic)** ("chronically frayed wire next to diasweeties machine") -may be used for **migraine prophylaxis** ("pounding headbell" ) * \*\*Amitriptyline is the only TCA with proven efficacy\*\* -Clomipramine(secondary amine) can treat **OCD** ("obessively neat kid re-arranging his marbles") * \*\*not as 1st line treatment - SSRIs are.\*\*
75
what are the **side effects** of TCAs?
-TCAs can cause **Sexual dysfunction** ("gym teacher rejected by Mrs. Pearson") -can cause **Seizures** ("ball hits yellow shirt kid and he becomes shakey") -------------------------------------------------------------------------------- -TCAs (mostly tertiary) have severe **antimuscarinic effects i**ncluding: * dry mouth ("dry as a cracker") * ​constipation * ​blurred vision ("blind as a bat") * urinary retention ("full bladder shaped tea kettle") * ​CNS effects ("mad as a hatter") \*\*the antimuscarinic effects are the most common side effects among all TCAs side effects \*\* \*\*\*the most potent antimuscarinic effects are exerted by Amitriptyline\*\*\* \*\*\*\*TCAs are **contraindicated** in **elderly** because of these severe antimuscarinic/antihistamine effects\*\*\*\* - ------------------------------------------------------------------------------- - TCAs **block H1 receptors** ("blacky with bee swatter") * leads to **sedation** ("blue shirt kid sleeping on table") ​leads to increased appetite **weight gain** ("red shit fat kid next to sleeping kid") ​-------------------------------------------------------------------------------- -TCAs **block α1 receptors** ("pink shirt girl holding single extinguished candle") * may cause **orthostatic hypotension** ("pink shirt girl next to tea party is passed out") ​​-------------------------------------------------------------------------------- -TCAs can cause **Serotonin syndrome** ("stack of smiley balls behind blue shirt dodger")
76
what are **cardiac side effects** cause by TCAs ? what is the treatment for these undesired effects ?
-TCAs block cardiac **fast Na+ channels** that may cause fatal cardiac arrhythmias ("inactivated peaNa+ butter jar") -can cause **wide QRS complex** on ECG ("Wide QRS-shaped crack in heart sign") -can induce **Torsades de pointes** ventricular tachycardia ("twisted Torsades streamer") \*\*the most common cause of death of patients treated with TCAs is TCA overdose causing fatal cardiac arrhythmias ("dodge ball hitting peaNa+ butter cookie stand and breaking \<3 cookies" - ------------------------------------------------------------------------------- - **Sodium Bicarbonate** can be used to treat widened QRS and ventricular arrhythmia caused by TCAs overdose (white
77
name the **MAO enzymes** and their actions !
**-MAO-A** ("albino mouse") breaks down **Serotonin** , **Norepinephrine** , **Dopamine** ("white mouse eating smiley cheese , compass cheese and dopa rope") **-MAO B** (" black mouse") breaks down **dopamine exclusively** ("black mouse eating rope")
78
name **non-selective MAOis**
**Tranylcypromine** ("Try a sip of wine !" sign on table) **Phenelzine** ("Funnel in wine bottle on table") **Isocarboxazid** ("Boxed wine on table")
79
what are **MAOis used for**?
-MAOis are **irreversible** ("mouse skeleton trapped in mouse trap) -useful in treatment of **Atypical depression** ("Chateu Tyramine ...not your typical winery") -useful in treatment of **depression** (not 1st line) ("happy/sad mask on chateu tyramine sign") -useful in treatment of **resistant depression** ("guy trying to open resistant wine bottle with happy/sad mask label")
80
-name **selective MAOis inhibitor**
**Selegiline -** selective MAO B inhibitor ("guy on ladder with _sledge hammer_ trying to hit black mouse") **Moclobemide** - selective MAO A inhibitor
81
what are **selective MAOis used** for ?
-useful for treatment of **Cogwheel rigidity** seen in **Parkinson's disease** since they **increase Dopamine** levels in the **CNS** | ("watch runing by cogwheels above sledge hammer")
82
what are the **side effects of MAOis ?**
-since non selective MAOis inhibit serotonin breakdown they have **similar side effects to SSRIs** including: * highest rate of **sexual dysfunction** among anti depressant * ​**orthostatic hypotension** * ​**weight gain** -**should be avoided** with tyramine containing foods such as **aged meats , wine and cheese** ("wine and cheese on table") -**tyramine** is usually **broken down** in the GI by **MAO enzymes** ("albino mouse eating GI meat") **-**when MAOis are adminestered tyramine is **not broken down** and **act as sympathomimetic** ("albino trapped in mouse trap and NE compass cheese released") -**Tyramine Toxicity** can percipitate a **hypertensive crisis** ("blonde lady is hypertensive and sweaty having steam come out of her ears ") -may cause **Serotonin Syndrome** ("pile of smiley cheese next to tricycle") -**should be avoided** with other drugs such as **TCAs** and **SSRIs** ("yellow tricycle in front")
83
what drug could be adminesterd for **management of hypertensive crisis** resulting from Tyramine toxicity ?
**Phentolamine**-reversible α1 and α2 antagonist ("phantom of the alpha behind blonde lady")
84
Name **Atypical Antidepressants**
**Bupropion (Unicyclic)** ("blacky pro ball player") **Mirtazapine (Tetracyclic)** ("mirth and misery" happy/sad mask) **Trazodone** ("cheerleader with Trombone")
85
Bupropion **MOA**
**Inhibits reuptake** of **Norepinephrine** and **Dopamine** via NET/DAT ("NET DAT ball pro") \*\*no effects on serotonin !- no smiley symbols\*\*
86
what can **Bupropion be used for ?**
-atypical antidepressant that used for treatment of **depression** associated with **hypersomnolance** (daytime sleepness) since it has **CNS activating effects** via **NE** ("depressed blue shirt boy aroused from sleep") \ -can be used for treatment of **tobbaco dependence** ("pros don't smoke" sign) **-** Bupropion is **less likely** to cause **weight gain** ("stay fit lose weight" sign ) **-**Bupropion **doesn't** cause **sexual dysfunction** ("kissing couple below the basket")
88
what are the adverse effects of **Bupropion ?**
- can induce **Seizures** * Bupropion is **contraindicated in Bulimia** since it can lead to seizures ("shaking popcorn binge snacker") * Bupropion is **contraindicated in anorexia nervosa** since it can lead to seizures ("shaking skinny blacky player") | ("shaking proball player dunking")
89
**Mirtazapine MOA** | ("Mirth and Misery")
-Blocks **5HT-2/5HT-3 receptors** ("retired shirts number 52 and 53 hanging ") -------------------------------------------------------------------------------- -Mirtazapine **blocks H1 receptors** leading to * **weight gain** - good for depressed \*anorexic * **​sedation** - good for depressed with \*insomnia ​-------------------------------------------------------------------------------- -blocks **α2 receptors** leading to **increased 5HT/NE** ("extinguished double candle above cam screen and released smiley/compass balloons") ​
90
**Trazodone MOA**
-Trazodone is a **Serotonin Modulator** ("marching drum player modulates serotonin smiley drum") -**minimal effects** on NE/Dopamine therefore Trombone far from "NET DAT BALL" -------------------------------------------------------------------------------- -**blocks 5HT-2** Receptors as well as **inhibits reuptake** ("marching drum player wearing retired shirt 52") -------------------------------------------------------------------------------- -Trazodone is **α1 antagonist receptors** ("lady tromboner holding single extinguished candle ") -------------------------------------------------------------------------------- -**inhibits H1** histamine receptors ("Bee swatter player")
91
Trazodone **adverse effects**
-Trazodone can cause **Priapism** ("TrazaBONER" male tromboner holding trombone in erected position) -can cause **orthostatic hypotension {via α1 antag.}** ("coach fainting on floor") -can cause **Sedation {via H1 antagonism}** ("sleeping players on bench") -can cause **sexual dysfunction** ("trombone player rejected by female player because he is out of her league yo'") -can cause **Serotonin Syndrome** ("pile of smiley balls on floor")
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what can **Mirtazapine** b**e used for ?** | ("Mirth and misery")
- Atypical Antidepressants _can be_ used as **1st line** treatment o**f depression** ("happy/sad mask" on cam screen): * some patients with depression are adminstered with **Mirtazapine** as 1st line of treatment when the adverse effects are actually desirable e.g.- **elderly/anorexic** **{**usually SSRIs} ​-Mirtazapine **doesn't** cause **sexual dysfunction** ("kiss-cam next to mirth/misery cam")
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Name the **mood stabilizers** | ("stabilizing ski poles")
**Lithium** ("lifthium lift") **Valproate** ("winter festiVAL") **Carbamazepine** ("classic car carved in ice") **Lamotrigine** ("kid on dads head wearing Llama outfit") **Antipsychotics** ("psychotic painting on high peak")
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what is **lithium** useful for ? | ("lifthium lift")
- lithium can treat **_bipolar disorder ​_** * **acute mania** and **maintenance** ("stabilizing chair lift" on "lifthium lift")
95
what are the **side effects of lithium**
-has very **narrow therapeutic index** ("narrow window of opportunity to get off chair LIFTHIUM") -lithium therapy can cause **hypothyroidism** ("pinguine on snowboard has undone bowtie") which presents with : * **weight gain** ("fat ass snowboarder") * ​dry skin * ​hair loss * ​constipation -lithium can cause **nephrogenic diabetes insipidus** ("insipidus peeing kid fountain") -diuretics like **thiazide** and **NSAIDs→** decrease **GFR** and **clearance** of lithium therefore **increase lithium** levels ("kid thighs on high dive" and pole saying "low clearance") -lithium is **teratogenic** and can cause **Ebsitein's anomaly** ("tarantula hat on yellow shirt girl") * **atrialization** of the **right ventricle** occurs as well as ASD and tricuspid valve defects ("large right snow head looks defected") -------------------------------------------------------------------------------- **_acute lithium toxicity_** * causes **GI symptoms [**nausea , vomiting ,diarrhea] ("early nauseated green shirt kid" ) **_chronic lithium toxicity_** * neurologic symptoms-**tremor** ("late trembling blacky girl") * neurologic symptoms-**ataxia** ("late falling black kid")
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what **other drugs** can be used to treat **bipolar disorder?**
**Valproate** ("winter festiVAL" sign) * acute mania and maintenance **Carbamazepine** ("classic car carved in ice") * acute mania and maintenance **1st** [Haloperidol] and **2nd** [Quetiapine] **antipsychotics** ("psychotic paintings on high peak") * acute mania **Lamotrigine** ("child and dad wearing Llama outfit") * maintenance only
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name the **broad spectrum Antiepileptics** ("Seize the Land")
**Valproate** ("festiVAL reception) **Topiramate** ("Toupee") **Lamotrigine** ("Llama") **Levetiracetam** ("Elevator")
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broad spectrum antiepiletpics **MOA**
-Increase **Na+ channel **_in_**activation** ("inactivated baskets of salty peanuts") -**metabolized** by the hepatic cytochrome **CYP450** system ("Chrome CYP450 canon on ship")
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what are broad spectrum antiepileptic drugs **used for ?**
- **Focal** Seizures - **Generalized** Seizures - **Juvenile Myoclonic** Epilepsy (J.M.E)
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**Valproate** | ("welcome festiVAL")
-Increases **Na+ channel inactivation** ("inactivated baskes of salty peanuts") -**increases GABA** levels in CNS ("elevated Cab of king of incas") -can cause **GI distress** (nausea,vomiting) ("incas king is nauseated ") -can cause **increased appetite** and **weight gain** ("king of incas is fat") -can cause **Tremors** ("trembelling weapon baseball bat") -can cause **Fatal hepatotoxicity** ("liver spot on inca cow") -can cause **Pancreatitis** ("lady inca squeezing sponge") -valproate can be **Teratogenic** ("Tarantula on inca shields") -valproate therapy **during pregnancy** can cause **neural tube defects** ("inca has baby on her back playing the tubes")
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**Topiramate** | ("admiral's Toupee")
-increase **Na+ channel **_in_**activation** ("inactivated baskes of salty peanuts") -**allosterically** binds to **GABA-A receptor** ("admiral shaking hand of Cab-A's inca driver") -can cause **somnolence** and **fatigue** ("fatigued soldier behinnd admiral") -can cause **confusion** and **cognitive slowing** ("soldier scratching his head behind admiral") -can cause **weight loss** ("thin arm of canon operator") -topiramate can cause **acute angle closure glaucoma** ("admirals helper holding high pressure eye kettle") -topiramate may increase the risk for **Urolithiasis** ("canon balls next to admiral")
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**Lamotrigine** ("Llama")
-increase **Na+ channels **_in_**activation** ("inactivated basket of salted peanuts") -can cause **Stevens Johnson Syndrome** /Toxic epidermal Necrolysis {SJS/TEN} ("sloughed off mask of Llama rider") -Llamotrigine may cause **diplopia** ("crossed eye camel")
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**Levetiracetam** ("elevator")
-MOA not entirely known -may cause **somnolence** ("sleeping elevator operator")
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name the **narrow spectrum antiepileptics** | ("Seize the night")
**Carbamazepine** ("classic car") **Phenytoin** ("classic tow car") **Gabapentin** ("Grab a pint! " on ice-cream parlor) **Vigabatrin** ("raised V-Cab transmission") **Tiagabine** ("tied up cab driver")
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what can **narrow spectrum** antiepileptics be **used for ?**
- useful in treatment of **focal seizures** - 2nd line agents used for maintainance during **status epilepticus**
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**Carbamazepine** ("classic car")
-1st line therapy for **Trigeminal Neuralgia** ("three glowing gems") -------------------------------------------------------------------------------- -increases **Na+ channel **_in_**activation** ("inactivated salty chip bags") -induces **CYP450** ("classic car Activated chrome plate CYP450") -can cause **ataxia** ("unbalanced stack") -can cause **diplopia** ("misaligned headlights of classic car") -can cause **D**rug **R**eaction with **E**osinophilia and **S**ystemic **S**ymptoms **S**yndrome {DRESS} ("eosinophilic dress of waiter 1") -carbamazepine is **teratogenic** ("driver has tarantula shirt") -may cause **Stevens Johnson Syndrome** (SJS) ("sloughed off mask of passenger next to driver of classic car ") **--------------------------------------------------------------------------------** -Carbamazepine can cause **SIADH** ("Inappropriate wet head of classic car driver") -can cause **agranulocytosis** ("sand timer") -carbamazepine therapy **during pregnancy** can cause **neural tube defects** ("neural tube exauhst")
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**Phenytoin** | ("classic tow car")
-increases **Na+ channel **_in_**activation** ("inactivated salty chip bags") -induce**s CYP450** ("classic car Activated chrome plate CYP450") -can cause **ataxia** ("unbalanced stack with waiter 2 ") -can cause **diplopia** ("misaligned headlights of tow car") -can cause **D**rug **R**eaction with **E**osinophilia and **S**ystemic **S**ymptoms syndrome {DRESS} ("eosinophilic dress of waiter 2") -carbamazepine is **teratogenic** ("towed car driver has tarantula shirt") -may cause **Stevens Johnson Syndrome (SJS)** ("sloughed off mask of towed car driver") -------------------------------------------------------------------------------- -phenytoin may cause **folate deficiency** leading to **megaloblstic anemia** ("spilled salad above tow car") -may cause **gingival hyperplasia** ("expanding gum") -may cause **hirsutism** ("trucker with big bushy beard") -phenytoin therapy **during pregnancy** may cause **cleft palate** ("trucker's cleft hat") -can **decrease bone density** ("fractured osteoporotic towed car axle")
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**Carbamazepine** and **Phenytoin** can both cause ... ("classic car and tow car")
drug-induced **Lupus** | ("wolf between classic cars")
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how should you treat **Status Epilepticus** ("order status" sign)
-treat acutely with **IV Benzodiazepines** Diazepam, Lorazepam and **Phenytoin** (2nd line) for maintenance ("Ben's diner in the background behind cars") -if this treatment didn't work **IV Phenobarbital** can be used to treat **refractory seizures** ("barbershop in the background")
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**Gabapentin** | ("Grab a pint! " on ice-cream parlor)
-blocks **voltage gated Ca+2** channels ("closed Calci-YUM Ice cream cooler door") -useful for treatment of **chronic pain** ("chronically frayed wire next to diasweeties machine") -can treat **diabetic neuropathy** ("diasweeties machine ") -useful for treatment of **Fibromyalgia** ("fiber bars in 1st row of diasweeties machine") -useful in treatment of **post-herpetic neuralgia** ("Zeus poppin from top of ice cream car") -can cause **ataxia** ("unbalanced stack of ice cream balls")
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**Vigabatrin** | ("raised V-Cab transmission")
**-irreversible** inhibition of **GABA-Transaminase** → **decrease** GABA degradation ("V-Cab _trans_mission")
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**Tiagabine** | ("tied up cab driver")
-inhibits GABA-**Reuptake** ("tied up driver can't be re-uptaken into cab")
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**Absence Seizures** are characterized by ... | ("Seize the day")
-type of **generalized seizure** -sudden momentary **lapse in awareness** accompanied by **staring , blinking , clonic jerks** ("inattentive students") -absence seizures manifest as **3 Hz spike wave** complexes on **EEG** ("3 spikes" sign on wall")
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what are the **drugs** used for **treatment** of **Absence Seizures**
**Ethosuximide** (modes of persuation:"ETHOS") **Valproate** ("farm festiVAL") **Lamotrigine** ("Llama outside the class")
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**Ethosuximide** | ("ETHOS")
-useful in treatment of **Absence seizures** (teacher holding "absences" clip board) **-Blocks** voltage gated **T-type Ca+2 channels** in the thalamus (closed Calci-YUM chocolate milk drink next to T thermos") -can cause **GI distress** ( nausea , vomiting) ("kid gets punched in stomach by bitch-ass bully") -ethosuximide may cause **lethargy** and **fatigue**
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**Valproate** ("farm fesiVAL")
-valproate is effective against **absence seizures**
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**Lamotrigine** | ("Llama" outside of class)
-Lamotrigine is effective against **absence seizures**
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name the **high potency** 1st generation antipsychotics ("kid high on roof")
_"van gogh's starry g**AZIN**g" - **"azine"** suffix_ - **Haloperidol** ("halo of gazing star") - **Trifluo**_per_**azine** ("kid **_try_**ing to **_fl_**y") **-Flu**_phen_**azine (**"kid trying to **_fl_**y")
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1st Generation antipsychotics **MOA**
-**block** dopamine **D2 receptors** in the CNS espeicalliy in **mesolimbic** and **striatofrontal** system ("Van Gogh holding double rope ") -FGA's have **long half life** and thus long duration of action since they're **highly lipophilic** ("kid on crazy peak holding long tapered flag")
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name the **low potency 1st Generation antipsychotics** ("van gogh's coloring tools on floor")
-**Thioridazine** ("color THEORYdazine") **-Chloropromazine** ("color-pro" paint on floor)
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what can **1st Generation** Antipsychotics be **used** for?
-can treat **_positive_** symptoms of **Schizophrenia-**hallucinations , delusions , disorganised thoughts ("Van Goch's right ear is cut off thus blocking positive voices") -useful in treatment of **acute psychosis** in many condition {e.g. bipolar disorder} ("kid on crazy peak holding flag") -may be used to treat **aggitation** , **aggression** ("kid on agitated peak with marionette") -can be used for management of **Tourette syndrome** ("tourette's marionette with agitated aggressive blacky kid")
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what are the **characteristic features** and **side effects** seen in **low potency** FGAs **(low potency** \> high potency)
-they have **antimuscarininc effects** including * dry mouth ("dry as a cracker") * constipation * blurred vision ("blind as a bat") * urinary retention -blocks **α1** receptors ("nurse holding single extinguished candle") * leads to **orthostatic hypotension** ("passed out couple in picture") **​-**blocks **H1** histamine receptor ("nurse holding bee swatter") * leads to **sedation** ("picture with Van Gogh's bed") | ("alice in wonderland tea party picture")
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what are the **characteristic features** and **side effects** seen in **High potency** FGAs (low potency**\< high potency)**
-high potency FGAs cause **E**xtra **P**yramidal **S**ymptoms * **Acute dystonia** ("Cocked head")/ in minutes * **​Akathisia** ("falling chair") /in days * **​Parkinsonism** ("cogwheels of carriage") /in weeks -Can cause **Tardive dyskinesia** ("kid in carriage sticking out his tongue") -------------------------------------------------------------------------------- -any drug blocking dopamine → **hyperprolactinemia** →galactorrhea, amenorrhea, impotence ("kfc kid has white mustache") ------------------------------------------------------------------------------- -can cause **N**euroleptic **M**alignant **S**yndrome (kfc bucket says "now more spicy") * generalized **"lead pipe" rigidity** * ​**altered mental** status, **fever**, autonomic **instability** * ​characterized by **Rhabdomyolysis** | ("kid on roof wearing extra pyramid hat")
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* *Side effects** seen after adminstration of First Generation Antipsychotics * *(low/high)**
-FGAs can cause **Torsades de Pointes** fatal cardiac arrhythmia ("twisted streamer") -can **lower seizure threshold** ("shaking kid hanging on streamer")
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**Chlorpromazine** ("color-pro paint")
-can cause **corneal deposits** | ("corn yellow color-pro paint")
126
**Thioridazine** | ("color THEORYdazine")
-can cause **retinal deposits** ("deposits on retinal color palette")
127
**name** the **2nd** generation (atypical) **antipsychotics** | ("Dali the atypical surrealist")
**_"quite please only whispering is appropriate "_** **Quetiapine** ("Quite") **Olanzapine** ("Only") **Risperidone** ("whispering") **Aripiprazole** ("appropriate") **Clozapine** ("**_clo_**zapine **_clo_**set") **Ziprasidone** ("black dress zipper") ​
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2nd generation (atypical) antipsychotics **MOA**
**-block** dopamine **D2** receptors in the CNS ("Dali holding double rope") -**Block** serotonin **5HT-2A** receptor ("cut smiley cheese")
129
what can **2nd generation** (atypical) antipsychotics be **used for ?**
-SGAs are useful in treatment of both **positive** and **negative** symptoms of **Schizophrenia** ("Dali hearing both positive and negative voices") **-**can treat **resistant depression** ("resisting bottle" from chateu tyramine) **-**useful in managment of **OCD** adjunctive with SSRIs ("obssesively neat museum coworker aligning the pictures") -can help manage **tourette syndrome** ( Dali holding "tourett's marionette")
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what are the **side effects** associated with **2nd** generation (**atypical) antipsychotics**
_-block **H1** histamine receptors_ * causes **sedation** ("passed out brown piece of shit in painting") _-blocks **α1** receptors_ ("extinguished single candle on wall") * ​causes **orthostatic hypotension** ("passed out brown piece of shit in painting") -SGAs block muscarinic receptors and have **Antimuscarinic effects** especially Clozapine but in general **less** antimuscarinic effects **than FGAs** * dry mouth * ​constipation * ​blurred vision * ​urinary retention ("antimuscarinic tea party painting hanging _behind clozapine_ closet and _partialy covered_") -SGAs , especially **Olanzapine** and **Clozapine** can cause * **Weight gain** ("fat face of brown piece of shit in painting") * **​ Hyperglycemia** ("bunch of candy on floor of painting") * **​Dyslipidemia** ("elevated butter" in painting) ​-SGAs can cause **torsade de pointes** ("twisted torsades streamer all over the damn place") | (coworker with "bee swatter" hitting bee paintings)
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**Clozapine** ("Clozapine Closet")
-can cause **Agranulocytosis** ("melting sand timers") -can cause **myocarditis** and **cardiomyopathy** ("surreal heart in melting painting") -clozapine **reduces seizures threshold** ("shaking clock in melting painting")
136
what is the **defining difference** between **1st** and **2nd generation** antipsychotics ?
- the **defining difference** is that in **2nd generation** drug therapy the **incidence** of **_E_**xtra **_P_**yramidal **_S_**ymptoms **is reduced [**EPS via blocking D2 Receptors] ("kid with EXTRA pyramid hat is causing disturbance and is asked to leave the exhibition") _EPS include (FGA\>SGA)_ * acute dystonia * ​akathisia * ​Parkinsonism \*\***Risperidone** has the **highest risk** of causing **EPS** among SGAs\*\* ("whispering kid whisperes to EXTRA pyramid hat kid") -blocking **D2** receptors leads to **hyperprolactinemia** [FGA\>SGA] ("disturbing kid has milk mustache") -------------------------------------------------------------------------------another difference is that the incidence of **_N_**euroleptic **_M_**alignant **_S_**yndrome is **also reduced** but is still possible [FGA\>SGA] * NMS Includes mental status changes , rigidity , autonomic instability , fever * ​NMS is associated with **rhabdomyolysis**
137
Name the Drugs used for **parkinson's disease**
**Levodopa** _DOPA decarboxylase inhibitor_ **Carbidopa** _COMT inhibitor_ **Entacapone Tolcapone** _MAOi B_ **Selegiline** _D receptor agonists_ **Ropinirole Pramipexole** _Endogenous Dopamine enhancement_ **Amantadine** _Antimuscarinic Drugs_ **Trihexyphenidyl ​Benztropine**
139
side effects of Levodopa
-levodopa can cause **GI distress** (due to peripheral conversion into dopamine) - levodopa can cause **cardiac arrhythmias** (due to peripheral conversion into dopamine) -levodopa can cause **orthostatic hypotension** (due to peripheral conversion into dopamine) - levodopa can cause **neuropsychiatric symptoms** e.g. anxiety, agitation, insomnia, confusion, hallucination (due to excess dopamine in the CNS) - chronic levodopa therapy can cause **response fluctuations** (wearing-off reaction, on-off phenomenon) and **dyskinesias** -chronic levodopa therapy can cause a **wearing-off reaction** (akinesia and dyskinesia re-emerge at the end of each dose) -chronic levodopa therapy can cause an **on-off phenomenon** (periods of akinesia alternate with periods of improved mobility, not related to dose) -the **therapeutic window** of levodopa therapy **narrows** as Parkinson’s progresses (unpredictable response to therapy) ("watch") - chronic levodopa therapy can cause **dyskinesias** (choreoathetosis of the face and distal extremities) - levodopa is **contraindicated** in **psychotic** patients
140
**Carbidopa**
- carbidopa (peripheral **DOPA decarboxylase inhibitor**) - carbidopa **increases the bioavailability** of levodopa (prevents peripheral conversion into dopamine) - carbidopa **decreases peripheral side** effects of levodopa therapy (but exacerbates neuropsychiatric side effects)
141
Entacapone Tolcapone
- (COMT) converts dopamine to (3-MT) in the CNS - tolcapone (a _peripheral_ and central COMT inhibitor) increases the **bioavailability of levodopa** - entacapone (a _peripheral_ COMT inhibitor) increases the **bioavailability of levodopa** - tolcapone (a _peripheral_ and _central C_OMT inhibitor) increases dopamine levels in CNS - tolcapone can cause **hepatic failure**
142
**Selegiline**
- monoamine oxidase B (MAO-B) selectively metabolizes dopamine - selegiline -a selective MAO-B inhibitor **increases dopamine** levels in the **CNS**
143
**Ropinirole** ("rope in a role") **Pramipexole** ("big pex")
**_Ropinirole_** (_D2_ dopamine receptor agonists) is an **important initial treatment of Parkinson’s** ("Rope in a roll"): **_Pramipexole_** (_D3_ dopamine receptor agonist) is an **important initial treatment of Parkinson’s ----------------------------------------------------------------------------------** - dopamine receptor agonists (e. g. ropinirole, pramipexole) treat **restless leg syndrome** (RLS) - -------------------------------------------------------------------------------- - dopamine receptor agonists (e.g. ropinirole) may **enhance impulse control disorders** (e. g. gambling, shopping, hypersexuality)
144
**Amantadine**
- amantadine **enhances** the effect of **endogenous dopamine** (by increasing its synthesis/release and inhibiting its uptake) - amantadine can treat some **motor symptoms** of Parkinson’s
145
**Trihexyphenidyl Benztropine**
-Trihexyphenidyl and Benztropine (_antimuscarinic agents_ used to treat parkinsonism) -trihexyphenidyl and benztropine (antimuscarinic agents) **improve tremor** and **rigidity** of Parkinson’s with no effect on bradykinesia
146
Levodopa metabolism
L-DOPA → Dopamine in periphery + CNS Levodopa **can** cross BBB Dopamine **can't** cross BBB
147
what is the **mechanism of action** by which opiates exert their effects ?
- opiates are **μ-opioid receptor agonists** ("μssage parlor") -activation of opiate receptors leads to opening of **K+ ion channel** causing hyperpolarization ("open banana barrels in the back") -activation of opiate receptors **closes Voltage Dependent Ca+2 channel** ("closed Calci-YUM ice cream cooler next to bananas") -closure of Voltage Dependent Ca+2 channel **prevents release of neurotransmitters** basically stopping the pain signaling in the brain ("worker disconnecting presynaptic wire from icecream cooler")
149
Name the **Semi Synthetic opiates** and classify them according to their strength
**_Strong_** Heroin Oxycodone **_Weak/Intermediate_** Dihydrocodeine **_Mixed Agonist/Antagonist_** Buprenorphine Nalbuphine
150
Tramadol **properties** ("synthetic weak/intermediate")
a **weak μ-opioid** receptor agonist used to manage chronic pain * inhibits **reuptake of norepinephrine** and **serotonin** ("North-South") | ("Distant tram")
151
Names of opiates agonists
**Fentanyl** (opioid analgesic) ("Fantasy”) **Morphine** (opioid analgesic) (“More fun") **Tramadol** ("Distant tram") (a weak μ-opioid receptor agonist used to manage chronic pain)
152
**Codeine** ("Barcode") **Orphan** ("dextromethorphan") **Properties**
**Opioid antitussives** * dextromethorphan antagonizes **NMDA receptors** ("Tethered nomadic camel")
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Opiates **Side Effects**
cause **CNS depression** (e.g.sedation) ("Cerebral towel") -opiates can cause **respiratory depression** ("Deflated lung vest") -opiates cause **miosis** (constricted pupils) ("Constricted hood") -can cause **constipation** ("Plunger") -can cause **biliary colic** (contract biliary smooth muscle) ("Biliary tree") -patients may develop **tolerance** to opiates (“All are welcome”) * tolerance **does not develop for miosis** or **constipation** ("Out of order”") ​-opiate induced **hyperalgesia** can occur with **chronic use** ("Causing pain") -**opioid withdrawal** ("Anxious, hot, and moist") * rhinorrhea * lacrimation * yawning * hyperventilation * hyperthermia * muscle aches * vomiting * diarrhea * anxiety
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**Methadone** ("DONE timer") **Properties**
**long acting** opioid used to **attenuate withdrawal** symptoms * methadone and buprenorphine have a **long half lives** used in opioid detoxification ("Long tapering flag")
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**Loperamide** ("Lop-eared rabbit") **Diphenoxylate** ("Dolphins") **properties**
**μ-opioid** receptors are located in the **GI tract** delay stool transit * can be used as **antidiarrheals** ("Removed muddy slippers") * Loperamid increases **colonic phasic segmentation →** increase stool transit time ("Loping back and forth")
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**Buprenorphine** Properties
long acting **partial μ-opioid** agonist used to **attenuate** **withdrawal** symptoms
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_partial μ-opioid agonists_ **Buprenorphine Nalbuphine ​Butorphanol** Properties
**partial μ-opioid** agonists can **induce withdrawals**
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**Naloxone** use ("No lax zone")
**μ-opioid antagonist** used to **reverse acute** opioid **toxicity** * can precipitate **withdrawals**
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**Naltrexone** use ("No tricks zone")
**μ-opioid** antagonist helps **maintain abstinence** in heroin addicts ("no tricks zone just results") helps **reduce cravings** for **alcohol** and **nicotine** ("Tempting alcohol") naltrexone can help with **weight loss** ("Getting fit")
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Name the **Synthetic** Opiates
_Strong_ **Meperidine Fentanyl Methadone** _Weak/ Intermediate_ **Diphenoxylate Loperamide Tramadol**