What are antihistamines? I'm Dr. Manan Shah, I'm an ENT and allergist with Wyndly Health. In terms of allergies, when your body's exposed to an allergy trigger, it releases a molecule called histamine.
Histamine causes the symptoms of allergies, like runny nose and watery eyes. So antihistamines block the release of histamine and fix your allergy symptoms, at least for the time that you're using them.
The most commonly known antihistamine is Benadryl. But in general, we recommend people use second-generation antihistamines like Claritin, Zyrtec, or Allegra, since these medications are less sedating. If you'd like to learn more, please subscribe.