Loratadine, sold under the brand name Claritin among others, is a medication used to treat . Loratadine;s peak effect occurs after 1-2 hours, and its biological half life is on average 8 hours (range 3 to 20 hours) . Clarinase Repetab, Claritine Active, Claritin Allergy + Sinus, Clarityne, Clarityne...