Robitussin Maximum Strength Cough + Chest Congestion DM (in each 20 mL) Other Information: Each 20 ml contains: Sodium 12 mg. Store at 20-25 degrees C (68-77 degrees F). Do not refrigerate. Robitussin Maximum Strength Nighttime Cough DM (in each 20 mL) Other Information: Each 20 ml contains: Sodium 14 mg. Store at 20-25 degrees C (68-77 degrees F). For ages 12 & over. Should be 18 or older to purchase. Cough + Chest Congestion DM: Dextromethorphan HBr (Cough suppressant). Guaifenesin (Expectorant). Controls cough. Relieves chest congestion. Thins & loosens mucus. Non-drowsy. DM max. Fast effective cough relief. Nighttime Cough DM: Dextromethorphan HBr (Cough suppressant). Doxylamine Succinate (Antihistamine). Controls cough. Relieves runny nose & sneezing. DM max. Fast effective cough relief. Maximum strength claim based on maximum levels of active ingredients per dose. Strong soothing action and fast, powerful cough relief. www.robitussin.com. For most recent production information, visit www.robitussin.com. Questions or comments? Call weekdays from 9 am to 5 pm est at 1-800-762-4675. Parents: Learn about teen medicine abuse. www.StopMedicineAbuse.org. Also Available: Severe multi-symptom cough cold + flu nighttime. Severe multi-symptom cough cold + flu. 12 hour cough relief.