Claritin (loratadine) is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose. 320 Russell Street Hadley, MA 01035 413-584-1223 fax 413-586-5679 TREATMENT OPTIONS FOR PET ALLERGIES (ATOPY) To search our entire website for exposure topics and articles, please use the search box in the upper right-hand corner of this page. What is the purpose of Drugs@FDA, and what are its main uses? What drug products are in Drugs@FDA? What drug products are not in Drugs@FDA? Why doesn't Drugs@FDA include dietary supplements? Claritin official prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions, pharmacology and more. I am allergic to sulfa drugs (Bactrim). Can I use Bacitracin ointment. Thank you. - Answered by a verified Pharmacist Claritin is an over-the-counter antihistamine drug used to treat allergy symptoms in human beings. From runny noses to watery eyes, sneezing, to general itchiness, Claritin can be an effective tool in any person’s arsenal come “hay fever” season.