Does allergy medicines (antihistamines) have any affect towards musclebuilding?

I'm in the medical field so I have dealt with this question before. The immune system learns to cope with these materials,developing immunity and preventing future allergic reactions. So in turn allergy medicines will not affect your ability to grow muscle or improve your stamina. Allergy medicines are used to block the effect the allergen has on your body so you can go about having a normal life. So you shouldn't worry about trying to improve your muscle m you'll be fine. And they should grow at a normal rate, based on your body.