From the manufactures website:
Mucinex Sinus-Max Day/Night has two different types of caplets--one to fight your symptoms during the day and the other to fight your symptoms at night. Mucinex Sinus-Max Day has a triple-action formula that contains three maximum strength medicines.* One medicine reduces swelling in the nose that causes sinus pressure. Another medicine thins and loosens mucus. And the third medicine relieves pain and headaches.
Warning: 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
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.
Recommended use: Do not take the day and night liquid gels at the same time. Do not take more than a total of 12 liquid gels in a 24-hour period. Do not take the first dose of the night liquid gels sooner than 4 hours after the last dose of the day liquid gels unless directed by a doctor. Take only as directed. Keep carton for complete product information. Do not take more than directed (see overdose warning). Do not take more than 12 liquid gels in any 24-hour period. Adults and Children 12 Years of Age and Older: Take 2 liquid gels every 4 hours. Children Under 12 Years of Age: Do not use.