A really important clarification is required here: we’re talking about reversible MAOIs. The MAOIs occurring in plants like Syrian rue and rhodiola have a low, reversible binding affinity. Pharmaceutical MAOIs—with the sole exception of moclobemide—are irreversibly binding. Using any hallucinogenic tryptamine while on an irreversible MAOI (phenelzine, tranylcypromine, isocarboxazid) will land you in ER, assuming you make it there.
@Kimmo, I know you’re not talking about pharma MAOIs, I just wanted to clarify the matter for the sake of public safety. Some people don’t always read carefully.