Yes. You can they work well together. My recently had an allergic reaction to a fruit or preservative in the juice. His Dr. put him on the antihististamine and steroid and the Zantac (antihis) helped...
An antihistamine, for example "Benadryl" is a histamine blocker. It blocks cells normal reaction to them like a runny nose or itching, etc. It is normally recommended for allergy symptoms like a...
OTC antihistamines, especially ones that say "non-drowsy," are pretty safe. They can have side effects, but these usually only appear with older adults. As for "too much" I would guess an unusually...