Drugs Used for Depression, Bipolar Disorders, and Attention Deficit Hyperactivity Disorders, and Attention Deficit Flashcards
What is the Amine Hypothesis?
the idea that deletion of neurotransmitters like NE, 5HT and DA cause severe depression as indicated by treatment with drugs like reserpine
Primary strategy for treating depression?
raise NE, and 5HT
What does the acronym SSRIs stand for?
selective serotonin reuptake inhibitors
What is the good way to remember the SSRIs by name? (a common suffix)
the “xetines” like fluoxetine and paroxetine but also sertraline, citalopram, and fluvoxamine
MOA of SSRIs?
selective blockade of 5HT reuptake
What are the uses of SSRIs?
- major depression
- OCD
- bulimia
- anxiety disorders
- premenstrual dysphoric disorder
What are the S/E of SSRIs?
anxiety, agitation, bruxism, sexual dysfunction, weight loss
Toxicity to remember common with SSRIs?
serotonin syndrome
What are the symptoms of serotonin syndrome?
sweating, rigidity, myoclonus, hyperthermia, ANS instability, seizures
What are some other drugs that when combined with SSRIs could lead to serotonin syndrome?
MAOIs, TCAs, and meperidine
Which SSRIs inhibit cytochrome P450?
fluvoxamine and fluoxetine
Which SSRI has the least drug interactions?
citalopram
What is the MOA of TCAs?
non-specific blockade of 5HT and NE reuptake
TCA suffix?
“pramine”
What are some TCA drug names?
amitryptyline
imipramine
clomipramine
Uses of TCAs?
major depression
phobic and panic states
OCD
Neuropathic pain
enuresis
What are other MOAs of TCAs besides its main serotonin and NE blocking properties?
muscarinic and alpha blockade
Toxicity of TCAs and how to remember?
3C’s coma, convulsions, and cardiotoxicity
What are some drug interactions of TCAs to remember?
Hypertensive crisis with MAO inhibitors
serotonin syndrome with SSRIs MAOIs, and meperidine
prevent antihypertensive action of alpha 2 agonists
What is an important suffix to remember for SNRIs?
“lafaxines”
MOA of SNRIs
inhibit reuptake of both serotonin and NE
S/E of SNRIs?
anorexia, somnolence, increase BP, SIADH, hepatotoxicity (duloxetine)
List/Name the SNRI drugs.
venlafaxine, desvenlafaxine, duloxetine
Toxicity of SNRIs?
serotonin syndrome with MAOIs, TCAs and meperidine
MAOI MOA?
irreversible inhibition of MAO-A and MAO-B
Use of MAOIs?
atypical depression
Name some MAOI inhibitors?
phenelzine and tranylcypromine
Drug interactions of SNRIs
- serotonin syndrome
- NE inc. can lead to hypertensive crisis
- drug releasers like tyramine, TCAs, a1 agonists, and levodopa should be avoided
Name some other Antidepressants not in the SSRI, SNRI, or TCA category.
trazodone, bupropion, mirtazapine
S/E trazodone.
cardiac arrhythmias and priapism, hypotension, sedation, etc
Trazodone MOA?
blocks 5HT reuptake
blocks 5-HT2B and 5HT2B receptors
alpha blocker
histamine blocker
Bupropion MOA?
dopamine and NE reuptake blocker
Use bupropion?
smoking cessation but not main choice
Mirtazapine MOA?
a2 antagonist
S/E of Mirtazapine?
weight gain
Benefit of using SNRIs over TCAs?
like TCA but less autonomic effects
Benefit of bupropion of trazodone.
because doesn’t affect 5HT it has less sexual S/E
Lithium is the DOC for what condition?
bipolar disorders
MOA lithium?
prevents recycling inositol (dec PIP2) by blocking inositol monophosphatase
dec cAMP
What type of drugs should be avoided when using lithium?
lithium is cleared entirely by kidney so drugs that decrease GFR or inhibit sodium reabsorption in nephron may decrease its clearance and increase t1/2. Ex: NSAIDs, ACEI, ARBs, and most diuretics.
What is an important distinction to make between the MOA of SSRIs and trazodone?
SSRIs block serotonin reuptake while trazodone blocks serotonin reuptake but also serotonin receptors themselves.
Trazodone also has H1 and alpha blockade
S/E of Lithium.
narrow TI
tremor, flu-like symptoms, life-threatening seizures
hypothyroidism and goiter
nephrogenic diabetes insipidus (dec ADH effect)
How can lithium cause hypothyroidism and goiter?
dec. TSH effects and inhibits 5’-deiodinase
How does lithium cause nephrogenic diabetes insipidus?
decreases ADH effect because blocks V2 receptors so water can’t be reabsorbed
What do you treat lithium induced nephrogenic diabetes insipidus with? Why?
amiloride
lithium competes for binding to sodium channels on the principal cells of the collecting duct (ENaC channels) if block these sodium channels then lithium can’t come in and decrease ADH effect. More aquaporin channels are produced so water can be reabsorbed
What are other drugs used to treat bipolar disorder besides lithium?
valproic acid and carbamazepine
What are the teratogenic effects of using lithium?
Epstein anomaly (malformed tricuspid valve
Does using methylphenidate or amphetamine have some cardiovascular toxicity?
yes
What is the MOA of atomoxetine?
selective NE reuptake inhibitor
S/E atomoxetine?
similar to TCAs