another one that no one talks about but is over the counter is scopolomine. Its alot like benedryl in the fact that its a delierent. My mom tripped off of it by accidently taking too much on a cruse ship a few years ago. It was pretty funny. Oh and i posted that trip report is on erowid. Anyway I haven't tripped on it but from what my mom said and described it seems totally dreamlike and stuff. Also i belive scopolomine is one of the akaloids in datura.