the syrups usually only cause nausea at first because it tastes like shit unless its got other active ingredients which some companies put in so that at the low dose it wont have any effect but if u do a whole bottle it makes u sick (their way of trying to prevent misuse) but anyway just get robitussin max str. cough and make sure its only got dxm as active ingredient and it shudnt make u nauseated while u trip because it takes like an hr at least for it to hit u