What do you mean by "short lived"? Phenelzine is an irreversible MAOI, which means its effects persist even after it's cleared from the body. The only way to re

What do you mean by "short lived"? Phenelzine is an irreversible MAOI, which means its effects persist even after it's cleared from the body. The only way to regain normal MAO function is to wait for the disabled enzymes to be replaced, which takes weeks.