BadMoon
Demi G0D Overseer
Alot of them have several doctors who may or may not know what the other is giving them. I know people who do this also.
I think Heath Ledger had doctors in different countries giving him different things.
Then they didn't or I guess forgot to tell their doctors what meds they were on.
In the really real world though most doctors request your medical records be sent to them before they decide to diagnose you. So take that as you will.
I guess both would be at fault.