If you had used other drugs (whichever kind) before finasteride did you get any kind of side effect? And if you have used some drugs after finasteride has the reaction changed?
In my case, before finasteride I would never get side effects from “normal” drugs (ibuprofen, etc.), but I used the drug ritalin and the antidepressant Zoloft for a small amount of time.
Ritalin caused me a lot of anxiety and difficulty comunicating, and Zoloft caused my libido to disappear completely (it returned after stopping the treatment, but probably not to 100%).
AFTER FINASTERIDE: I have taken both of these drugs after finasteride, ritalin causing shrinkage and extreme anxiety (some days after taking it), a “crash”, and zoloft causing some anxiety and penile pain and not working to do its function: I had to stop it after less than two weeks because it only caused anxiety and pain.