I am not sure. I think you should have been made aware of the possible interaction. However, I take a drug that is metabolized in the liver as well and when I take Tylenol, it elevates my liver enzymes. As long as I am careful and don't take too much, I am fine. However, I KNOW this and that makes all the difference. So, yes, you should have been told. I put it on the sholders of the doctor more than the pharmacist. The dr prescribed it. The pharmacist should have had the info there, but he is the second line of defense, not the first. The doctor made the possibly dangerous mistake here, IMO.