Hi Roni. I take Klonopin for Generalized Anxiety Disorder. I've been on it for over five years, and have not had an alcoholic beverage in that entire time, because my doctor told me that it's extremely dangerous to mix Klonopin and alcohol. I hate that I can't have a glass a wine with dinner, but I've been told NO NO NO.
I agree wi - call the doctor and ask. It's possible that the doctor was not aware of your husband's drinking when he/she wrote the RX. Definitely call the doctor, to be safe.