Learn about Benadryl (Diphenhydramine) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. Find yourself needing help relieving allergies or a pesky itch? Check out the many allergy and itch relief products BENADRYL® offers that may help provide relief. Compare prices and find coupons for Benadryl (Diphenhydramine) at more than 60,000 US pharmacies. Save up to 80% instantly! Benadryl is a brand name for a number of different antihistamine medications used to stop allergies. In the United States and Canada, it is the first-generation antihistamine diphenhydramine. For the oral form of Benadryl, dosage recommendations range from 25 to 50 mg every four to six hours. This eMedTV Web page also includes dosing information for topical Benadryl, and discusses dosing in children. For fast & effective hay fever & allergy treatment visit the Official BENADRYL® site! Home to the Social Pollen Count, for the latest UK Pollen Count & Forecast. Effective allergy relief in a small, yet powerful antihistamine tablet. BENADRYL® Allergy ULTRATAB® Tablets work when you need it most. Benadryl in the parenteral form is a sterile, pyrogen-free solution available in a concentration of 50 mg of diphenhydramine hydrochloride per mL. Find yourself needing help relieving allergies or a pesky itch? Check out the many allergy and itch relief products BENADRYL® offers which may help provide relief. Benadryl (diphenhydramine) is an antihistamine used to treat allergies, hives, insomnia, motion sickness, and mild cases of Parkinsonism. Benadryl is available in generic form and over-the-counter. Common side effects of Benadryl include.