Delsym's advanced time-release formula acts fast and lasts 12 hours, quieting your cough while you power through a busy day or get a good night's sleep.. Each 5 mL dose contains dextromethorphan polistirex equivalent to 30 milligrams of dextromethorphan hydrobromide.. Delsym's active ingredient helps quiet your cough by suppressing your cough reflex.. Bottle contains 3 ounces of alcohol-free, orange-flavor cough relief..