L-Cet contains Levocetirizine Dihydrochloride 5 mg tablets, an antihistamine medication used to relieve allergy symptoms like sneezing, runny nose, and itchy/watery eyes. Each pack contains 20 tablets for oral administration. L-Cet is a prescription antihistamine medication. The active ingredient Levocetirizine helps block histamine, a natural substance that causes allergy symptoms. The recommended dosage should be taken as directed by your healthcare provider. Store in a cool, dry place away from direct sunlight. Keep out of reach of children.