Dose - Need some info on diphenhydramine: 300mg enough to trip?

[Stoners_Life]

Ok here we go S.W.I.M. has just taken 300mg of diphenhydramine (Benadryl) S.W.I.M. took 200mgs about an hour ago and is now feeling a little heavy and slowed down S.W.I.M. just took another 100mgs so 300mgs in total S.W.I.M. is

6'3
280 pounds

S.W.I.M wonders if he has taken enough will he get a good trip or does he need more he has never done shrooms or anything and doesnt know how he will do if he starts to hallucinate although S.W.I.M does smoke Mary j quite frequently any help on what to expect or if he should take more and hows the trip at 300mg