There are no adverse interactions between amoxicillin and RIMAs or psilocybin; just be sure to be feeling well enough in terms of the infection you're taking the amoxicillin for, as physical malaise can, IME, color the trip.
I am paranoid of my brain. It thinks all the time, even when I'm asleep. My thoughts assail me. Murderous lechers they are. Thought is the assassin of thought. Like a man stabbing himself with one hand while the other hand tries to stop the blade. Like an explosion that destroys the detonator. I am paranoid of my brain. It makes me unsettled and ill at ease. Makes me chase my tail, freezes my eyes and shuts me down. Watches me. Eats my head. It destroys me.