Is this forum there are tons of posts and stories about PSSD. Serotonin drugs are bad and are usually no better than a placebo. They can cause permanent damage, like finasteride and accutane.
Remember that the way they make conclusions about serotonin drugs and allo is based on extrapolation. We cannot directly measure allo or serotonin or anything in the brain in an alive human being. The theory that serotonin goes through a deficiency in the brain which causes depression itself always been on shaky ground in science–it is the pharma industry that took it and ran with it to obviously make lots of money on the hypothesis that it is how depression works.
Finasteride has been used in scientific research to knock out allo in animals like rats. Finasteride inhibits enzymes that are needed to make allo! So if one’s brain is damaged by finasteride, and the mechanics that should be functioning are not functioning, then taking a serotonin drug is not going to do much.