You can try to assert a malpractice case against the doctor who prescribed it, but to win such a case, you would need medical evidence (e.g. testimony from a psychiatrist who has examined you) that the medicine harmed you and also that it was negligent, or unreasonably careless, to have prescribed it for you based on what was known then (i.e. based on the state of medical knowledge, your symptoms at the time, etc.). That is, you'd have to be able to prove not just the harm done but that no reasonable doctor would have prescribed it at the time, and you need medical expert testimony to do that. Normally it would be too late (15 years) to bring this claim, but since you only recently (1 year) became an adult and so able to bring a claim on your own behalf, you should still be able to assert it.