R.E.
Drinking whilst taking an A/D such as Effexor is usually fine in moderation. Some doctors are okay with 1 or two drinks, occasionally for their patients...others, say no...but I'd say most people do it will no ill effects.
However, drinking whilst taking a benzodiazepine is an absolute, resounding no.
(a couple of drinks with an SSRI could make for a bad hangover/bad anxiety management for a few days afterward...drinks with a benzo can be deadly)
Talk to your prescribing doctor, and if you get the go ahead, see how one beer affects you and your management.
S.C.