Relieve your seasonal allergies with Claritin 24-hour tablets. Claritin works on indoor and outdoor allergies, plus it won"t make you drowsy or hyper. Adults can relieve allergy symptoms like sneezing, runny nose, itchy and watery eyes and itchy throat and nose with one tablet. Each 10-mg. antihistamine tablet provides 24 hours of relief. This box of Claritin includes 30 tablets.