What are the effects of drinking alcohol while on bystolic (nebivolol)?

Nothing good: If you are on a beta blocker, i assume its either for a heart rhythm problem or for hypertension. Alcohol makes both of these conditions worse, as well as having potential drug-drug interactions. While "social" drinking (i.e. No more than 2 standard drinks on an occasion) would not likely have major effects if done very occasionally, more regular or heavier drinking is bad for either condition.