Product Description Only Mucinex 12-Hour Chest Congestion Expectorant Tablets has an extended release bi-layer tablet to deliver congestion relief. The first layer is absorbed quickly by your body for fast-acting relief. The other layer dissolves slowly to continue relieving your chest congestion for 12 hours. Mucinex 12-Hour Chest Congestion Expectorant Tablets Relieves Chest Congestion, Thins and loosens mucus. Ingredients Active ingredient: Warnings: For adult indications, do not use for children under 12 years of age; if you are now taking a prescription monoamine oxidase inhibitor (MAOI) (certain drugs for depression, psychiatric or emotional conditions, or Parkinson''s disease), or for 2 weeks after stopping the MAOI drug. If you do not know if your prescription drug contains an MAOI, ask a doctor or pharmacist before taking this product. Ask a doctor before use if you have persistent or chronic cough such as occurs with smoking, asthma, chronic bronchitis, or emphysema; cough accompanied by too much phlegm (mucus). When using this product: do not use more than directed. Stop use and ask a doctor if: cough lasts more than 7 days, comes back, or occurs with fever, rash or persistent headache. These could be signs of a serious illness. Pregnancy/breast-feeding warning: If pregnant or breast-feeding, ask a health professional before use. Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away.