What is a common brand for an antihistamine that treats allergies?

Zyrtec is a well-known brand for an antihistamine that effectively treats symptoms of allergies, such as sneezing, itching, runny nose, and hives. It contains cetirizine as its active ingredient, which works by blocking the action of histamine, a substance in the body that causes allergic symptoms. Antihistamines like Zyrtec are commonly used for seasonal allergies, hay fever, and allergic reactions, making them a go-to option for patients looking to alleviate allergy symptoms.

Other options provided are associated with different therapeutic uses. Diabeta is a brand name for glyburide, a medication used to manage blood sugar levels in type 2 diabetes. Flonase contains fluticasone, a corticosteroid used primarily to relieve nasal symptoms associated with allergies but is not classified as an antihistamine. Nitrostat is a brand for nitroglycerin, a medication used to treat angina pectoris, which involves chest pain related to heart conditions. Hence, Zyrtec stands out as the correct choice for treating allergies among the options listed.