Compare to the active ingredient in Delsym Orange Flavor. Dextromethorphan Polistirex Extended-Release Oral Suspension is an extended-release orange flavored cough suppressant liquid that provides all day or all night relief for up to 12 hours. This medicine helps to relieve the impulse to cough to help you get to sleep. Contains sodium metabisulfite, a sulfite that may cause allergic-type reactions. Does not contain fever reducer or pain reliever. Alcohol and gluten free. Dosage cup included.