Trippy feeling coming on
Maaaan please don't use diphenhydramine to trip or get high on
Just take the DXM by itself next time bro and throw away the diph. If you want to trip balls then DXM should satisfy you by itself. Be safe my dude.
500 mg of dph at once? I believe that is enough to cause sudden cardiac failure and psychosis due to inhibition of sodium and potassium ion channels.
If you consider feeling dead, unreal, spiders, bizzare disorganized behavior, severe confusion, sweating, and seeing people who arent there tripping then yes.