antidepressants Flashcards
tricyclic antidepressants (1st gen)
resemble phenothiazine antipsychotics
tricyclic antidepressant ADME
first pass effect lipid soluble bound to plasma proteins slow elimination active metabolites
tricyclic antidepressant MOA
inhibit NE and 5HT reuptake
block muscarinic ACh receptors
block alpha1 NE receptors
2-3wk to start seeing effect
8-10wks for max effect
changes in neurogenesis
tricyclic antidepressant effects
sedation CNS depressants promote sleep mood elevation (may feel worse first) high dose: seizure antimuscarinic effects arrhythmias orthostatic hypotension
imipramine
tricyclic AD
bed-wetting
desipramine
tricyclic AD
amitryptyline
tricyclic AD
most commonly used
clomipramine
tricyclic AD
OCD
nortriptyline
tricyclic AD
tricyclic antidepressant SE
orthostatic hypotension arrhythmias weight gain withdrawal OD: fatal
all antidepressant BBW
increase risk of suicidal thinking/behavior in children, adolescents, and young adults
tricyclic antidepressant Rx interactions
potentiate other CNS depressants
potentiate hypertensive effects
monoamine oxidase inhibitors
additive effects
mirtazapine
2nd gen AD
blocks 5HT2 and a2 adrenergic receptors
SE: weight gain
trazodone
2nd gen AD
inhibits 5HT uptake
blocks 5HT2 receptors
SE: priapism (hella big dick…stay away)
buproprion
2nd gen AD
weak inhibitor of reuptake
use: smoking cessation
SE: seizures
DONT GIVE IF SEIZURES OR EATING DISORDERS
Selective Serotonin Reuptake Inhibitor use
anxiety disorders
SSRI SE
nausea GI upset HA insomnia nervousness sexual dysfunction withdrawal
fluoxetine
SSRI
paroxetine
SSRI
fluvoxamine
SSRI
sertraline
SSRI
citalopram
SSRI
escitalopran
SSRI
vilazodone
SSRI
inhibits 5HT reuptake
5HT1 receptor partial agonist
vortioexetine
SSRI
inhibits 5HT reuptake
agonist/partial agonist/antagonist at different 5HT receptors
Serotonin/Norepinephrine Reuptake Inhibitor use
anxiety disorders
SNRI SE
hypertension
withdrawal
Duloxetine
SNRI
chronic pain
Venlafaxine
low dose: blocks 5HT reuptake
high dose: blocks 5HT and NE reuptake
SE: insomnia
Desvenlafaxine
SNRI
Levomilnacipran
SNRI
Monoamine Oxidase Inhibitors Rx interactions
hypertensive crisis if sympathomimetic amines are given or tyramine ingested
stroke/death
potentiate tricyclic antidepressants, CNS depressants, opiates
serotonin syndrome
MAO inhibitors and L-Trp interacts with SSRI’s causing excessive 5HT neurotransmission
AMS
seizures
coma
Tx: stop all serotonergic drugs
mood stabilizers use
bipolar disorder
lithium use
mania
mood stabilizer in bipolar disorder
lithium effects
calms mania
dampens mood swings
leukocytosis
lithium ADME
rapid absorption
not metabolized
renal excretion
lithium SE
low therapeutic index fine tremor (Tx: propanolol) thyroid enlargement cardiac arrhythmias inhibits ADH action sodium retention weight gain
lithium Rx interactions
diuretics decrease renal clearance