re: Strangest side effect you had from a prescribed drug?

SO is exquisitely sensitive to medications. If there's a side effect, she will have it. She was prescribed something or other one time, and the Dr told her, "there's an extremely rare condition that starts with a rash and is potentially fatal. It'll never happen, but we're required to tell you about it." Sure enough, she ends up in the ER with a rash.