Can you take beta blockers and antihistamines?

Check with a cardiologist as some antihistamines block the IKr channel which is the potassium repolarization channel triggering repolarization of the ventricles. Blockage of IKr channels results in increased QT intervals which produce cardiac arrythmias. It is shocking that few people do actual research and could get into trouble. If you are taking an antihistamine and get heart palpitations, stop the pill and get one from a cardiologist that is safe for the heart.