I'm so sorry that happened. But since physical substances are involved, then it's most likely the drugs that are activating it and you should take him to a proper doctor.
That drug used to be a prescription medication until doctors, psychiatrists, began to notice that it did more harm in the long run than good. I would say that the AP was coincidental, maybe made it slightly worse, but this is mostly the drug's doing.
I guess you can keep waiting for it to wear off but that's risky and would give you a lot of trouble to keep him somewhere that he can't accidentally hurt himself or others while he's off in some drug-fueled la-la land.