Why the hell can't I inject into my quads? As some of you may know I am on tren. ed and prop. eod, and therefore need to start changing injection sites. I do all my shots myself and so I used to use my quads, all the time. But now it seems that everytime I use my quads, my muscle has a spasm and it hurts like hell. This hasn't always happened, this happen to anyone else, any suggestions?