Anti-depressants & Mood Stabilizers (TCAs & Atypicals) Flashcards
Definition of depression?
Affective disorder w/ emotional, cognitive, behavioral, somatic regulation
Definition of depression?
Affective disorder w/ emotional, cognitive, behavioral, somatic regulation
Core syndrome?
Persistent emotion, guilt, untreatable physical symptoms
Pathophys of depression?
Decrease of monoamines (NE & serotonin)
When do anti-depressants take clinical effect?
Takes weeks
BBW for all anti-depressants & mood disorders?
<24 y/o you should monitor changes in depression, suicidal thinking, unusual behavior
What is reactive or secondary depression? What are its symptoms? What is its tx?
it is secondary to loss, drugs, alcohol, other psychiatric disorders. Symptoms: Core syndrome. Tx: remits spontaneously + responds to Rx
What is major depressive disorder? Symptoms? Tx?
Recurrent. Symptoms: core syndrome + vital signs. Tx: anti-depressants + ECT
What is bipolar disorder (manic depression)? Symptoms? Tx?
Mania + depression episodes. Symptoms: increased elation, irritable, less sleep needed, grandiose notions, increased talking. Tx: mood stabilizers + anti-depressants
What are the issues with pharmacogenomics?
ABC (MDR1/P-gp) @ BBB –> decreased access to brain
What drugs are substrates for MDR1?
Citalopram, Paroxetine, Amitriptyline, Venlafaxine
Non-substrates for MDR1?
Mirtazapine, fluoxetine
What are the TCAs?
Amitriphyline, Imipramine, Nortriptyline
What do the TCAs treat?
- Major depression
- Bedwetting (Imipramine)
- OCD (Clomipramine)
MOA of TCAs?
decrease reuptake of 5HT and NE into presynaptic terminals –> increased actions of neuroTx + change receptor profile with treatment
What else do the TCAs do?
block ACh, 5-HT, histamine receptors (these are the basis of ADEs)
Are the TCAs highly lipid soluble?
Yes, the get into the brain and into fat
Are the TCAs protein bound?
Yes, they have a high volume of distribution and a long half life
Describe the metabolism of TCAs?
Tertiary amines –> secondary amines via demethylation (imipramine –> desipramine; amitriptyline –> nortriptyline)
-Metabolized via CYP2D6
What are the acute effects of TCAs?
drowsy + decreased cognition
chronic effects of TCAs?
increased cognition; NOT euphoria
DDIs w/ TCAs?
EtOH, other sedatives; TCAs block clonidine
ADEs of TCAs?
- Orthostatic hypoTN (antagonism of alpha-adrenergic receptors)
- Anti-DUMBBELLS + CI Glaucoma (antagonism of ACh receptors)
- Sedations (antagonism of histamine + alpha adrenergic receptors)
- Metabolic/Endocrine: gain weight + sexual disturbance
TCAs have a low TI. What does OD cause?
Arrhythmia, cardiac failure, CHF
- Acidosis, delirium, seizure
- FA says Tri-C’s: Coma, Convulsions, Cardiotoxicity
What are the atypical anti-depressants?
Amoxamine, Maprotiline, Trazadone/Nefazodone, Mirtazepine, Bupropion, Venlafaxine, Duloxetine
*BoopMir MapTraz & Amox VenDul
Atypical anti-depressants treat?
Major depression
Amoxapine MOA?
Basically a TCA that is a dopamine antagonist
Amoxamine ADE?
DA antagonism –> extrapyramidal effects (Parkinsonism)
Maprotiline MOA?
SNRI
Maprotiline ADE?
seizures, sedation, orthostatic hypoTN
Trazodone, Nefazodone use?
used for depression assc w/ anxiety + sleep disturbance
Traz, Nefaz MOA?
SSRI
Traz, Nefaz PK? ADE?
CYP3A4 inhibitor; short half life. Nefazodone has been largely discontinued due to hepatotoxicity
- FA: sedation, nausea, priapism, ortho hypoTN
- *Called Trazabone (priapism)
Mirtazepine MOA?
alpha 2 receptor antagonist –> increased release of 5HT + NE
Mirtazepine ADE?
Antagonizes 5HT-2 recpetors; sedation (anti-histaminergic); weight gain. Less GI & sexual disturbance than SSRIs
Bupropion is also used for?
Smoking cessation; formulated for slow release
Bupropion MOA?
weak DA, 5HT, NE reuptake inhibitor; metabolites = SNRI
Bupropion ADE?
increases monoamines –> restlessness, anxiety, seizures
Venlafaxine MOA?
SSRI + SNRI w/ no antihistamine, anti-ACh, anti-adrenergic properties (avoid TCA ADEs)
Venlafaxine ADE?
small sustained HTN
Duloxetine MOA? A unique thing about it?
SNRI; it is the most potent SNRI available
PK of duloxetine?
50% bioavailability; 95% protein bound; CYP2D6 metabolized
Vilazodone MOA?
potent 5HT1a partial agonist and SSRI