what med and what psychedelic is it? for example something like LSD, it has few severe negative interactions, so you're likely to be in the clear, and something like MDMA has way more interactions and risk.
got it. afaik antipsychotics don't have major negative interactions with most psychedelics since the actions are pretty different. i have heard anecdotally that antipsychs will severely reduce the effects of acid/shrooms.
be safe, test your drugs, don't overindulge, and you should be good to go.