•Temporarily reduces fever. •Relieves minor aches and pains. •Lasts up to 8 hours. Children's Advil® Suspension For Fever and Minor Aches & Pains. When your child has a fever, relief can't wait. Children's Advil® brings down fever fast and lasts up to 8 hours with just one dose. Help Your Child Feel Better Fast. •Nothing reduces fever faster 1 or lasts longer.