Alcohol and it's interaction with "the big 3"

[Dav7]

I drink on average about 16-20 pints of beer a week, and will be buying the "big 3" next week. However, I'm just wondering if any of the big 3 - propecia/ rograine and nizoral have a bad reaction to alcohol? For instance does the use of say propecia react badly to alcohol in the body, and if so - what would be the safe time frame that one should avoid drink after taking such medicines? Or is alcohol intake irrelevant when it comes to taking medicines such as propecia and rograine?