You are not reccomended to take aclcohol with zimovane. Usually I have a medium to good tolerence to alchohol maybe 6 bottles to become moderately drunk. When taking zimovane my experience is that one beer is fine, two is fine, 3 is giddy and 4 is quite drunk. Made the mistake of drinking 6/7 beers while taking zimovane, I went to bed as normal but woke up in my car the next morning having driven to my parents house 4miles away wearing a tuxedo and having bought flowers from somewhere. scary stuff.
IN conclusion one or two is fine but not just before bed and no more than that!!