Heroin and cocaine is a fairly common combination, and diphenhydramine is sometimes used to potentiate opiates (such as heroin). I've also seen Xanax be 'recomm

Heroin and cocaine is a fairly common combination, and diphenhydramine is sometimes used to potentiate opiates (such as heroin). I've also seen Xanax be 'recommended' to handle the comedown from cocaine. It doesn't seem like a particularly unlikely mix of drugs TBH.