Why can't antibiotics be taken with beer? Myth or Fact: Antibiotics cannot be taken with beer because it damages the effect of the drug with the interaction in your body of the alcohol. 

I take antihistamines with beer and they work, so not sure if anyone knew about this one?
As everything in life, it depends.... From the Mayo Clinic:


  Antibiotics and alcohol can cause similar side effects, such as
  stomach upset, dizziness and drowsiness. Combining antibiotics and
  alcohol can increase these side effects.
  
  A few antibiotics — such as metronidazole (Flagyl), tinidazole
  (Tindamax) and trimethoprim-sulfamethoxazole (Bactrim, Septra) —
  should not be mixed with alcohol because this may result in a more
  severe reaction. Drinking any amount of alcohol with these medications
  can result in side effects such as flushing, headache, nausea and
  vomiting, and rapid heart rate.


So some antibiotics may not cause issues while others might. Best thing to do is follow the medications warning label