The medical community has mixed thoughts on the subject. I have read one alcohol drink is beneficial for the heart. Another school of thought advises against.
Heavy drinking is a depressant on the system and of course would be contraindicated as it would enhance the effect of a BB to slow the heart rate, etc. I believe a drink or two is a stimulant? and may just offset some of the BB effect for a short period of time.
I don't drink in public establishments anymore as I don't wish to be exposed to the smoke.