In theory should a huge dosage of the psych of choice be able to break through the tolerance induced by antidepressants because they don't antagonize 5ht2a but my experience is that there are too many side effects and the amount of chemical required puts a strain onto the budget. I went through at least 150mg, if not more, of 5-MeO-MiPT during a couple of hours and all I got was a scattered feeling brain. No euphoria, no trip.
Interestingly did LSD work though when combined with some low dosed DXM (120mg, and 200mcg of 1cP-LSD). Not a full trip but I got the colors and visions, took more than 2 hours for the effects to manifest but they eventually did. A later attempt with dosing LSD didn't work though. I wonder whether the DXM was the reason. But combining venlafaxine with DXM is considered dangerous and should be avoided if you haven't already done that combo and know therefore that it was safe for you up to a given dosage.
And yeah - empathogens get dulled too. The first attempt at 6-APB while on venlafaxine gave me some nice feelings but very threshold. A later attempt with more material didn't work at all.