I can tell you from first hand experience that Venlafaxine does not inhibit the effects of LSD in all people. It might in some, but certainly not in all. I have one data point.

Also, it does limit, if not entirely mask, the effects of some common recreational dopamine reuptake inhibitors.

LSD activates 5HT2A. Mirtazapine is the only medication I posted about that blocks 5HT2A.

I'm not sure what the mechanism behind venlafaxine's blunting effect on LSD is.