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NURS 572 Pharm 32
Ch 32 Antidepressants
| Question | Answer |
|---|---|
| simplified MOA depression | lack of monamines Ser, Nor |
| 3 classes of antidepressants | TCA, SSRIs, atypicals |
| MOA of TCAs | has structure similar to phenothiazine --> similar SEs of blocking H-1, Alpha-1 and muscarinic. IS A NONSELECTIVE blocker of Nor and 5HT serotonin |
| MOA SSRI | selectively blocks 5HT serotonin |
| MOA atypical antidepressants | mixed 5HT/NE reuptake inhibitor |
| TCA general properties | high ind variability, 1-3 week response, 1-2 month max effect. long half like |
| TCA SEs | cardiotoxic (combo direct cardiac effect, anticholinergic effect) . . . orthostatic, sedation, paradoxical diaphoriesis, seizures, hypomania |
| name 4 TCAs | imipramine, amitriptyline, desipramine, protriptyline |
| TCA moderately sedating | imipramine |
| TCA VERY sedating, MANY SEs | amitriptyline |
| TCA few SEs | desipramine |
| TCA NOT sedating | protriptyline |
| Major uses SSRI | major depressive, OCD, GAD, PMDD, PTSD, bulimia, panic, social phobia |
| do SSRI's have orthostatic, sedative, anticholinergic, cardiotoxic SEs | no - they ONLY selectively inhibit 5HT. Most are highly protein bound, long acting, CYP450 metabolism |
| common SSRIs SEs | compliance limiting sexual dys, N/D, HA, CNS stimulation, sweating |
| What is important dosing SSRI | must taper off to avoid serotonin syndrome |
| what is serotonin syndrome | too much ser --> conf, disorientation, hallucinations, incoordination, sweat, tremore, dysphoria |
| S/S of serotonin withdrawal syndrome | anxiety, dizz, HA, N, tremor, dysphoria |
| name 6 SSRIs | citalopram, escitalopram, fluoxetine, fuvoxamine, poxetine, sertraline |
| SSRI with fewest interactions (2) | citalopram, escitalopram |
| SSRI with longer half-lives (2) | fluoxetine, sertraline |
| SSRI with relatively short action | paroxetine |
| SSRI specific for OCD, shortest half-life | fluvoxamine |
| atypical, also for smoking cessation | bupropion |
| atypical, hepatotoxic | nefazodone |
| atypical, more effective than SSRIs, dose related HTN significance | venlafaxine |
| atypical, related to loxapine for added neuroleptic action (schizo & depression) | amoxapine, which has SEs of EPS, TD, anticholingergic, sedations and seizures all possible SEs |
| atypical, VERY sedating, reported priapism | trazodone |
| atypical SNRI, CNS and GI SEs | duloxetine |