Claritin is used for:br Relieving symptoms of seasonal allergies such as runny nose; sneezing; itchy, watery eyes; or itching of the nose and throat. It may also be used for other conditions as determined by your doctor. Claritin is an antihistamine. It works by blocking a substance in the body called histamine. This helps to decrease allergy symptoms.br br How to use Claritin:br Use Claritin as directed by your doctor. Check the label on the medicine for exact dosing instructions.br br * Take Claritin by mouth with or without food.br * If you miss a dose of Claritin , take it as soon as possible. If it is almost time for your next dose, skip the missed dose. Go back to your regular dosing schedule. Do not take 2 doses at once.br br Ask your health care provider any questions you may have about how to use Claritin.