Like I said, I have taken mescaline on abilify. I was on 15 mgs for a long time at that point. And it didn't affect anything. I took about a foot to a foot and a half of San Pedro cactus. But a mescaline trip can really vary depending on the cactus. Are you sure it is psychedelic? Have other people you know tried the same cactus? If it is verifiably psychedelic and you know what you are doing as far as cooking it then you should be fine. 5 mgs of abilify is an extremely low dose and mescaline is a powerful drug so i doubt it would be counteracted by the abilify. The best way to experiment with mescaline is to do it. I am sure you will be fine. I did it twice while on abilify and like i said I tripped pretty good. Well safe tripping and have a good time. Later.