What is claritin/loratadine used for?

Allergy. Mainly for the treatment of allergy symptoms such as runny nose, scratchy throat, itchy nose and eyes, etc.
Seasonal allergies. Claritin, available otc as generic loratadine, is a nonsedating antihistamine, often used for seasonal allergic rhinitis. It is good medicine with low incidence of side effects, thus made available otc quite sometimes ago. It's also sold in combo with decongestant, claritin-d, for those having much trouble with nasal congestion. If u have trouble and Loratadine not adequate, consult doc. Good luck.