which of the following anti depresent is a RIMA
**Core Concept**
Reversible inhibitors of monoamine oxidase A (RIMAs) are a class of antidepressants that selectively inhibit the action of monoamine oxidase A (MAO-A), an enzyme responsible for the breakdown of monoamines such as serotonin, norepinephrine, and dopamine. This class of medications is distinct from irreversible MAOIs, which can have broader effects on the body.
**Why the Correct Answer is Right**
Moclobemide is a RIMA that works by irreversibly inhibiting MAO-A, thereby increasing the levels of monoamines in the synaptic cleft. This leads to improved mood and reduced symptoms of depression. Moclobemide's selective action on MAO-A reduces the risk of dietary interactions and hypertensive crises associated with non-selective MAOIs.
**Why Each Wrong Option is Incorrect**
**Option A:** Tranylcypromine is a non-selective, irreversible MAOI, which is distinct from RIMAs.
**Option B:** Bupropion is a norepinephrine-dopamine reuptake inhibitor (NDRI) with some effects on MAO, but it is not a RIMA.
**Option C:** Phenelzine is another non-selective, irreversible MAOI, which is not a RIMA.
**Clinical Pearl / High-Yield Fact**
RIMAs like moclobemide offer a safer alternative to non-selective MAOIs for patients with depression, with fewer dietary restrictions and reduced risk of hypertensive crises.
**Correct Answer:** C.