In Each Extended-Release Tablet Other Information: Each tablet contains: magnesium 25 mg. Store between 20-25 degrees C (68-77 degrees F). Guaifenesin & dextromethorphan hydrobromide 1200 mg/60 mg extended-release tablets expectorant& cough suppressant. New! Controls cough. Thins & loosens mucus. Keep the carton. It contains important information. www.robitussin.com. Questions? call weekdays from 9 AM to 5 PM EST at 1-800-762-4675. For most recent product information, visit www.robitussin.com. Parents: Learn about teen medicine abuse. www.StopMedicineAbuse.org.