Do either Prozac or viibryd fall into the MAOI category?

No, neither Prozac (fluoxetine) nor Viibryd (vilazodone) falls into the MAOI (monoamine oxidase inhibitor) category. Prozac is a selective serotonin reuptake inhibitor (SSRI), while Viibryd is classified as a serotonin partial agonist reuptake inhibitor (SPARI). Both medications work primarily by affecting serotonin levels in the brain but do so through different mechanisms than MAOIs.