Benylin Children's Chesty Coughs Non-Drowsy is a sugar-free, strawberry-flavored syrup designed to help your child feel better. It contains an active ingredient, Guaifenesin, which works by thinning and loosening phlegm build-up in the chest, making it easier to cough up. This non-drowsy formula is suitable for children, removing excess phlegm and providing relief from chesty coughs.