Benadryl

Benadryl is a brand name that Johnson & Johnson (acquired fall 2006) and Pfizer use for several different allergy medicines.
 * In the U.S., Benadryl is diphenhydramine, a first generation antihistamine. It is also formulated in combination with other active ingredients and sold under variations of the Benadryl name.
 * In the U.K., Benadryl Allergy Relief is acrivastine, a second generation antihistamine.
 * In the U.K., Benadryl Once a Day is cetirizine, a second generation antihistamine.