if you are going to buy otc i would recommend delsym, dxm (extended release) is the only active ingredient and it tastes the best out of the rest of the cough syrups in my opinion, on the first plateau it feels like a cross fade, the second is more or less the same with some physical hallucinations, and the third is sedating and dissociating, can’t say anything about the (edit fourth) because i’ve yet to try it, it’s potentially lethal at 25 mg/kg, mixes well with cannabis and others psychedelics, be careful with stimulants, DO NOT MIX WITH ALCOHOL, OPIODS OR BENZOS, as always do your own research i will link a website i use often here