Gluten free. Guaifenesin 600 mg/dextromethorphan hydrobromide 30 mg extended-release tablets (expectorant/cough suppressant). Controls cough. Thins and loosens mucus. Compare to Mucinex DM active ingredient (This product is not manufactured or distributed by Reckitt Benckiser LLC, owner of the registered trademark Mucinex). Parents: Learn about teen medicine abuse. www.StopMedicineAbuse.org. 100% Quality Guaranteed: Like it or let us make it right. That's our quality promise. 855-423-2630. Questions or comments? 1-855-423-2630.