Kirkland Signature Extra Strength Acetaminophen Gelcaps contains the active ingredient Acetaminophen 500mg, a highly recommended over-the-counter ingredient, that temporarily reduces fever and relieves minor aches and pains for adults and children 12 years and over due to: Headache The Common cold Backache Minor pain of arthritis Toothache Muscular aches Premenstrual and menstrual cramps