I have major depression since I was 15. I used imipramine 150mg for 22 years. They tried at least 15 new meds the last 7 years. Done have worked. I just wanted to know how many there is because they seem to be rejecting my nerons and are not making the right connections. Is there a reason for them MANY not doing anything? That is why I asked How many antidresants are there and what are my odds are for being put on one that will make my nerotransmitters make contact" I am seeing a doctor.