Dxm. its in robitussin and you usually have to be 18, so get a bum or older sibling to buy it for you. research that shit, erowid.org.
Im under the impression that there arent really any good highs left OTC, except DXM. I like a low dose of benadryl, but it doesnt make me trip, just get relaxed. everything else is either dangerous, unpleasant or both, from what ive heard. I try to avoid getting high on obscure chemicals, so Ive never taken dph (to trip), or dramamine, or nutmeg, or even DXM.
dhm/dxm combo or dhm solo (Diphenhydramin) when you made few experiences with dxm it isn't very dangerous to combine it with dhm. just look to have a tripsitter and take 250-300mg dxm + ca. 250mg dhm. it wont be dangerous, just do no other drugs like mdma / amphetamin because of serotonin syndrome it quite often makes you see insects.
I'm not sure but I took 4mg of lorazepam yesterday, had me feeling really fucked up and then I started smoking and thats when shit started moving. I had a couple of beers throughout the night while smoking many more bowls, by the end of the night the visuals were intense!
If you want to know about DXM, read the FAQ by William White. You can find it about a dozen places on the internet. It will tell you exactly how much to take and what to expect. If you've never done it before, I'd recommend a second plateau dose.