Liquid Pain Reliever and Fever Reducer for Kids Nothing fights fever faster or longer(1) than Children's Advil. In just one dose, this kids' fever reducer and pain reliever reduces fever and relieves minor aches and pains due to common cold, headache or teething. Formulated for children ages 2 to 11 years, this liquid pain medicine contains ibuprofen, a pain medication that reduces and controls fever. Just one dose of this liquid pain relief medicine lasts up to eight hours. Advil liquid children's ibuprofen is easy to measure and has a pleasant grape flavor that's easier for kids to take. The medicine in Children's Advil is the #1 pediatrician-recommended active ingredient in a fever reducer/pain reliever. (1) Among non-prescription analgesics