Been drinking beer & having an allergic reaction, is Benadryl (diphenhydramine) safe?

Yes, if not too much. Benadryl (diphenhydramine) can cause drowsiness, which would be potentiated by alcohol. It would likely be safe after 1 beer, but would be problematic after more. I definitely would not drive after the combination.

Related Questions

If I get severe irritability when I take benadryl (diphenhydramine) is it still ok to take occasionally when having an allergic reaction? Safe to take?

Appears safe. If irritability is your only side effect it is apparently not a physical threat. Are you able to tolerate the irritability without threatening your livelihood, family, or significant relationships? There are other antihistamines. Read more...

What can I do for an allergic reaction to lignocaine? Is Benadryl (diphenhydramine) safe to use for the reaction?

It depends. Whether or not Benadryl (diphenhydramine) is safe to use depends on what type of reaction you are having. Firstly, it is rare to have an allergic reaction to a local anesthetic. If you are having swelling it may be due to the procedure and not the medicine. If you are having itching through your body then Benadryl (diphenhydramine) would be helpful but you may also need a steroid pill. Read more...