A few months ago, while we were still together, my ex went to the doctor to get a refill on his antidepressant and asked for an RX for benzodiazapines (tranquilizers), which are highly addictive and not supposed to be given to addicts. I was stunned that they gave them to him.
He started taking the benzos AND drinking with them, and the effect was truly frightening. He went completely out of his head. They amplify the effect of alcohol by at least double, and mixed with alcohol can cause you to stop breathing in your sleep and die.
A lot of doctors just don't know enough about addiction.