Neurology and Psychiatric Drugs Flashcards
Name the centrally acting skeletal muscle relaxants
Diazepam (Benzodiazepene)
Tizanidine (α2 agonist)
Baclofen
Diazepam
-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

Tizanidine
-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

Dantrolene
- 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

Botulinum toxin
- 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

Baclofen
- 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
Non depolarizing muscular relaxant
- 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

Depolarizing muscle relaxant
- 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

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

what are Benzodiazepens used for ?
(“Ben’s Diner”)
-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

Benzodiazepens side effects
-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”)

what are the alcohol withdrawal symptoms
? what role do Benzos have in treating alcohol withdrawal
-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 )
what is the key difference between Benzodiazepens and Barbiturates
-the difference between them is that Barbiturates bind different allosteric site on GABA-A receptors
(“barber shop located on other side of Cab-A”)
How can you reverse Benzodiazepens-induced sedation
-Flumazenil is a competitive antagonist at the BZD receptor and can reverse Benzos-induced sedation
(“violent-antagonizing fluffy muzzled dog”)
Name the non-Benzodiazepine hypnotics
(“catching some Z’s”)
the 3 Z’s
Zolpidem
Zaleplon
esZopiclone
non-Benzodiazepine hypnotics MOA
-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”)
Pharmakokinetics of Zolpidem Zaleplon es-Zopiclone
-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”)

Side effects on non-Benzos
-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”)

what are non-Benzodiazepene hypnotics used for ?
-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”)
how can you reverse non-benzos sedation ?
Flumazenil - BZD Competitive antagonist
(“fluffy muzzled dog biting on zzz matresses red arrow sign”)
what other drugs can be used to treat insomnia ? MOA?
(“let your sleepless nights melt away”)
- *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”)
Name Barbiturates
Thiopental
(“The Ol’ quick shave”)
Primidone
(“Perm is done!” primadona)
Phenobarbital
Barbiturates MOA
-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”)
























































































