I see this as less a correlation to meds/treatment, and more as proof that these people had issues in the first place.
This is a crude, yet apt analogy. Lets say you have a crackhead, a rabbi, and a circus clown living in your house. One day you come home and the VCR/Betamax combo you recently purchased is missing. You inspect the rooms of your guests for clues. You notice the crackheads rooms is littered with trash, vomit, a vagrant, pawn shop receipt, and small pieces of crack/cocaine, the room smells of foul-burning chemicals. You notice in his bathroom that he has been using a different type of hand soap, and shampoo than the clown and the rabbi. Ideas flutter, and you begin to formulate that the added chemicals in the soap/shampoo combo may have had an effect on the crackhead over an extended period of time. The two liquid soaps together may have even reacted with each other, heightening their otherwise innocuous effects. These reactions may have caused a chemical response in the section of the brain that controls impulsive, deviant, behavior such as theft, and smoking crack with street folk.
That or the crackhead just stole your shit so he could go get some crack.