A nurse is providing an in-service to the unit about medications that are classified as antihistamines. Which of the following medications are considered an antihistamine? (Select All That Apply).

The correct answers are A (Certirizine) and B (Diphenhydramine) because they are both antihistamines. Antihistamines are drugs that block the action of histamine, a substance in the body that causes allergic symptoms. Certirizine and Diphenhydramine are commonly used to relieve symptoms of allergies such as sneezing, itching, and runny nose. Beclomethasone (choice C) is a corticosteroid used for asthma and allergies, not an antihistamine. Phenylephrine (choice D) is a decongestant and not an antihistamine. Choices E, F, and G are not provided, but they would be incorrect as antihistamines based on the definitions provided.