Lecture 7 (psych)- Exam 4 Flashcards
Medications for psychiatric disorders:
* What NTs are altered in the brain?
pathophysiology
* What receptor and behavior does serotonin, NE and DA deal with?
- Serotonergic: 5HT receptor-> Mood and reproductive behavior
- Noradenergic: NE receptor-> alertness and focus
- DA: DA receptor->Cognitive function, motivation and awakeness
Selective serotonin reuptake inhibitors (Ssris)
* What is the MOA?
* Increases what? (effect)
- Inhibits serotonin reuptake from synaptic cleft by blocking serotonin reuptake transporters (SERTs)
- Effect: Increased serotonin activity related to improved mood
SSRIs
* What are the agents? (6)
- Citalopram (Celexa)
- Escitalopram (Lexapro)
- Fluoxetine (Prozac)
- Fluvoxamine (Luvox)
- Paroxetine (Paxil)
- Sertraline (Zoloft)
SSRIs
* What are the different components with agent selection ? (9)
- History of response
- Pharmacogenetics
- Comorbidities
- Medical history
- Presenting symptoms
- Potential for drug-drug interactions
- Adverse effect profile
- Patient preference
- Cost
BBW-suicidal ideation
* Antidepressants increased the risk compared to placebo of what?
* Effect was no seen in who?
* What needs to be weighed?
- Antidepressants increased the risk compared to placebo of suicidal thinking and behavior (suicidality) in short-term studies in children, adolescents and young adults
- Effect was not seen in adults older than 24 years
- The risks should be weighed with benefits
BBW-suicidal ideation
* patients and families should be educated to watch for what?
* What needs to happen with prescribing practitioner?
- Patients and families should be educated to watch for clinical worsening, suicidality, unusual behavior
- Close observation and communication with prescribing practitioner recommended
Serotonin syndrome
* When does this occur?
* Usually the result of what? Give examples?
* What is CI?
Occurs when serotonin levels are too high
* Usually the result of drug interactions with antidepressants that cause increased levels of serotonin
Examples:
* Triptans
* Monoamine oxygenase inhibitors (MAOIs)
* St. John’s Wort
* Dextromethorphan
* Alcohol
CI: during or within 10 days of an MAOI
Serotonin syndrome
* What are the sxs?
- Sweating (shivers)
- Myoclonus
- Autonomic nervous system instability
- Rigidity - muscles
- Temperature increase
- Seizures
SMARTS
What is the txt of serotonin syndrome?(3)
- Supportive care
- Benzodiazepines
- Cyproheptadine – serotonin antagonist (antitode)
What are the examples of SNRIs?
* venlafaxine (Effexor)
* duloxetine (Cymbalta)
* desvenlafaxine (Pristiq)
* milnacipran (Savella)-For FM
* levomilnacipran (Fetzima)**
What is the MOA of SNRIs? What is the effect?
MOA: inhibit serotonin and norepinephrine reuptake transporters in the synaptic cleft
Increased activity of serotonin and norepinephrine associated with increased mood
*baseline QTc recommended
*
SnRIs
* May increase what? Why? What need to need to monitor and when?
* What is more common with SSRIs?
- May increase blood pressure and tachycardia (increased NE) – monitor BP before and after initiation
- Nausea more common than with SSRIs – start low and titrate
Atypical antidepressants
* _ -line treatment in most cases
* What are examples of it being used?
Second-line treatment in most cases
May be considered first-line for specific situations
* Depression associated with insomnia
* Depression in elderly with anorexia and weight loss
* Minimal to no sexual side effects
Atypical antidepressants: Mirtazpine
* What is the MOA?
Inhibits alpha-2 receptors at presynaptic cleft
* Alpha-2 receptor activation normally decreases NE and 5HT3 in the synaptic cleft
* Alpha-2 inhibition will increase levels of NE and serotonin in the synaptic cleft
Selectively inhibits 5HT 2A and 3A so serotonin selectively binds to 5HT1A receptor (stronger link to depression)
Inhibits histamine-1 receptors - sedation
Atypical antidepressants: Mirtazapine
* What are the SE?(5)
- Sedation
- Increased appetite
- Weight gain
- Dry mouth
- Sexual side effects = placebo (good for someone with sexual SE, insomina)
Atypical antidepressants: Trazodone and nefazodone
* What is the MOA?
- Selectively binds to 5-HT2A receptors so more serotonin binds to 5-HT1A receptors
- Weekly inhibits serotonin reuptake at the synaptic cleft – increasing serotonin
- Strong histamine-1 receptor inhibitor – SEDATION
- Alpha-1 receptor inhibitor – orthostatic hypotension, priapism
What is the BBW nefazodone?
Hepatic failure has been reported (1: 250,000 patients)
Trazodone is extensive metabolism via what?
CYP3A4
Atypical antidepressants: Trazodone and nefazodone
* What are the SE?(4)
- Sedation (61% trazodone)
- Dizziness (36%)
- Dry mouth (27%)
- Nausea (19%)
- Orthostatic hypotension
- Headache
- Weight neutral
Atypical antidepressants: Vilazodone (Viibryd) and vortioxetine (Trintellix)
* What is the MOA
* Vilazodone is metabolism by what?
MOA:
* Strong inhibitors of serotonin reuptake at presynaptic cleft (like SSRIs)
* Bind selectively to 5-HT1 and stimulate receptors
Vilazodone extensive metabolism by CYP3A4
Atypical antidepressants: Vilazodone (Viibryd) and vortioxetine (Trintellix)
* What are the SE?(6)
- Increased risk of serotonin syndrome
- Anticholinergic
- Nausea / diarrhea
- Sexual dysfunction
- Weight gain – vilazodone
- Abnormal dreams – vortioxetine
Atypical antidepressants: Bupropion
* What is hte MOA?
- Binds to NE and DA receptors at the presynaptic cleft inhibiting reuptake; no effect on serotonin
- Blocks nicotinic receptors-benefits with smoking cessation
Atypical antidepressants: Bupropion
* What are the SE?
- Least sexual side effects
- Dry mouth
- Nausea
- Anxiety
- Insomnia – take in the AM
- Tachycardia
- Decrease seizure threshold – especial in patients with history of seizures or eating disorders
Atypical antidepressants: Bupropion
* Cl in who?(4)
CI: bulimia or anorexia nervosa, use of MAOI inhibitor within last 14 days, seizure disorder
Tricyclic antidepressants
* What is tertiary and secondary medications? What is there is MOA?
Tertiary (imipramine, amitriptyline, clomipramine)
* Inhibit serotonin and NE reuptake transporters
Secondary (nortriptyline, desipramine)
* Inhibit only NE reuptake transporters
Tricyclic antidepressants
* Not recommened as what?
* Usually reserved as what?
- Not recommended as first line due to side effect profile
- Usually reserved as last line therapy
TCAs
* What are the SE?(3)
* MC causes of death?(3)
*
- Anticholinergic side effects
- Serotonin syndrome
- Cardiac toxicity – increase QTc / arrythmias
- MC causes of death from TCAs: Convulsions, Coma, Cardiac toxicity
TCAs
* What is the warning?
* Inhibits what?
- Warning: use with caution in patients with suicidality
- Inhibit CYP450 enzymes
MAOIs
* What is the MOA?
- Prevents the breaks down of serotonin, NE, or DA neurotransmitters pumped back into the presynaptic cleft
- NT build up in presynaptic vesicles
- More NT released
MAOIs
* What are the SE?
Serotonin syndrome
* Other medications that increase levels of serotonin should be held for 14 days after stopping MAOIs
* Time needed to regenerate MAOIs
* Hypertensive crisis
MAOIs
* What is the hypertensive crisis? (5)
- Hyperthermia
- Increased blood pressure
- Increased heart rate
- Arrythmias
- Agitation
MOAIs
* MC with combining what? Ex? (3)
* What is the treatment?
MC with combining MAOIs with foods high in tyramine
* Cheese
* Wine
* Beer
Treatment:
* Phentolamine -> adrenergic antagonist
* Blocks NE receptors
Lithium
* What is the MOA?
* What is the therapeutic index?
MOA:
* Exact mechanism unknown
* Thought to inhibit conversion of inositol monophosphatase to inositol decreasing overall inositol levels
* OVERALL decrease in neurotransmitters (KNOW)
Narrow therapeutic index that requires close monitoring
Lithium
* What are the SE?
- Nausea, vomiting, diarrhea
- Tremor
- Nephrogenic diabetes insipidus
- Hypothyroidism
- Leukocytosis
- Weight gain
- Sexual dysfunction
- Cardiotoxicity
Lithium
* What is the cause of nephrogenic DI SE? What do you use?
* Why hypothyroidism SE?
* What are toxic levels?(6)
Nephrogenic diabetes insipidus – blocks ADH from binding to receptors; urine does not concentrate
* Loop diuretics, thiazide diuretics or triamterene may be used
* If hydrochlorothiazide used – decrease lithium dose by 50% and monitor potassium levels
Hypothyroidism – blocks TSH from releasing thyroid hormone
Toxic levels – renal failure, ataxia, confusion, dysarthria, coma, death
Lithium
* When are levels measured?
Levels should generally be measured
* 5-7 days after new or increased dose ( Goal levels: 0.8 to 1.2 meq/L)
Lithium
* Lithiumlevels are closely related to what? (3) Explain?
Lithiumlevels are closely related to renal function, salt balance, and water balance
* Dehydration causes higher lithium levels
* Increasing sodium intake causes lower lithium levels
* Decreased sodium intake causes an increase in lithium levels
Lithium
* What are the contrainations?(5)
- Significant renal impairment
- Sodium depletion
- Dehydration
- Significant cardiovascular disease
- Pregnancy = cardiac anomalies
Lithium
* What are the baseline labs?(5)
- Urinalysis
- BMP (blood urea nitrogen (BUN), creatinine, calcium)
- Thyroid function studies
- Pregnancy test for women of childbearing potential
- Electrocardiogram (ECG) for patients over age 40
Lithium
* What are the maintenance labs?
- BUN and creatinine should be checked every two to three months during the first six months of therapy, and every 6 to 12 months thereafter
- Thyroid function should be checked once or twice during the first six months, and every 6 to 12 months thereafter
Block voltage-gated Na+ channels; inhibit action potentials in excitatory neurons