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MAO inhibitors
| Question | Answer |
|---|---|
| MAO inhibitors | Isocarboxazid, Phenelzine, Tranylcypromine, Selegiline |
| Isocarboxazid | Marplan |
| Phenelzine | Nardil |
| Tranylcypromine | Parnate |
| Selegiline | Emsam |
| Tyramine | Amino Acid that helps regulate blood pressure by triggering cells to release norepinephrine, thus acting as an indirect sympathomimetic. It is also a substrate for MAO, an enzyme that breaks down excess tyramine. |
| Which MAO inhibitors have a contraindication with severe renal disease? | Isocarboxazid, Phenelzine |
| Warnings | Hypertensive Crisis; Serotonin Syndrome |
| Which MAO inhibitor is used for Parkinson Disease? | Zelapar ODT (Selegiline) |
| Tyramine rich foods | Aged cheese, pickled foods, fermented food, aged food, smoked food |
| Monoamine oxidase (MAO) | Enzyme that binds to tyramine substrate and breaks down excess tyramine, thus decreasing levels of norepinephrine, dopamine, and serotonin |
| Drug interactions | Drugs that increase serotonin and epinephrine |
| What drugs require 2 week washout period? | SSRIs, Bupropion, SNRIs, TCAs |
| Which SSRI requires a 5 week washout? | Fluoxetine |
| Counseling | Avoid tyramine rich foods |
| MAO inhibitor toxicity symptoms | severe hypothermia, hypertension |
| How long does MAO inhibitor toxicity take to develop? | Patients may initially be asymptomatic, but symptoms should generally appear within the first several hours, sometimes delayed up to 24 hours. |
| Which MAO inhibitor comes in a patch? | Selegiline (Emsam) |
| MAO inhibitor onset of action | Initial effects observed within 1-2 weeks with continuing to 4-6 weeks |
| MAO inhibitor half life (PO Meds) | 10 hours |
| MAO inhibitor half life (Transdermal Patch) | 20 hours |