Compare to Extra Strength Tylenol PM Caplets active ingredients. With 500 mg of pain reliever acetaminophen and 25 mg of diphenhydramine HCl, a nighttime sleep-aid, Amazon Basic Care Acetaminophen PM caplets help relieve minor pain and headaches plus makes it easier to get to sleep. Extra-strength Amazon Basic Care Acetaminophen PM caplets are easy to swallow, aspirin free, gluten free, and non-habit forming. Container features a child-resistant cap.