Which of the following drugs is an antihistamine? Clonazepam Albuterol Diphenhydramine Amlodipine

The correct answer is Diphenhydramine.<br /><br />Diphenhydramine is an antihistamine medication commonly used to relieve allergy symptoms such as runny nose, sneezing, and itchy or watery eyes. It works by blocking the effects of histamine, a substance in the body that causes allergic symptoms.<br /><br />Clonazepam is an anticonvulsant medication used to treat seizure disorders and panic disorders. Albuterol is a bronchodilator used to treat asthma and other respiratory conditions. Amlodipine is a calcium channel blocker used to treat high blood pressure and angina.