Antihistamines are a type of medication used to treat allergies and allergic reactions. There are several synonyms for antihistamines, including allergy medicines, histamine blockers, and allergy relief pills. Other related terms include anti-allergy drugs, antiallergenics, and antihistaminics. In addition to oral medications, antihistamines may come in the form of nasal sprays or eye drops. Some common brand names for antihistamines include Benadryl, Claritin, and Allegra. It is important to consult with a healthcare provider before taking any medication, including antihistamines, to ensure proper dosing and to discuss any potential side effects or interactions with other medications.