Antidepressants and 3rd Class Medical

Last I knew all antidepressants were immediately disqualifying for any
class of medical certificate. Is this still the case? If a pilot has a
current 3rd class medical, and then begins taking antidepressants, I
assume his certificate immediately becomes void. What is the process
for re-obtaining the medical certificate after treatment is completed?
What kinds of things is the FAA looking for? Are there certain
antidepressants that they are more lenient on than others (after
treatment)?

Thanks! =)

--TWH
--PP-ASEL-IA