Compare to Infants' Tylenol Oral Suspension active ingredient. When baby relies on you to feel better, turn to Amazon Basic Care Infants' Pain & Fever, Acetaminophen 160 mg per 5 mL, Dye-Free Grape Flavor. The active ingredient in this oral suspension liquid medicine is acetaminophen, a fast, effective pain reliever and fever reducer for children ages 2 to 3 years. Free of alcohol, aspirin, ibuprofen, gluten & high fructose corn syrup.