DPH, AKA diphenhydramine, is an antihistamine that can in large doses MASSIVELY fuck your world up. It's the primary active ingredient in Benadryl.
I don't think it's TOO physically bad for you, but doing it daily is probably going to fry your liver and dissolve your sanity. JUST KIDDING LOL it can cause heart failure, early dementia, kidney and bladder problems, and sudden colon enlargement (seriously).
I don't even get why deleriants would be fun lol LIKESERIOUSLYHOWDOESTHISSEEMLIKEANYONESIDEAOFAGOODTIMEFORREALSWHYWOULDYOUEVERSee also:
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