Zyrtec Allergy Relief Liquid Gels provide 24-hour relief of your worst indoor and outdoor allergy symptoms. With 10 milligrams of cetirizine hydrochloride per capsule, this prescription-strength allergy medicine starts working hard at hour 1 and works twice as hard when you take it again the next day. This seasonal allergy medicine provides relief from symptoms caused by hay fever and other upper respiratory allergies, including runny nose, sneezing, itchy, watery eyes, and itching of the nose or throat. From the number 1 allergist-recommended brand among OTC oral antihistamines, this cetirizine hydrochloride anti-allergy medicine is effective in treating indoor allergies from dust, mold, and pet dander, and outdoor allergies caused by tree pollen, weeds, and grasses. Zyrtec all-day allergy relief antihistamine capsules with cetirizine HCl are suitable for adults and children six years and older, with one dose providing effective allergy relief for a full 24 hours.