Do not use 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 a MAOI, ask a doctor or pharmacist before using 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 is accompanied by excessive phlegm (mucus). Stop use and ask a doctor if symptoms are accompanied by fever, rash, or persistent headache, cough persists for more than 1 week or tends to recur. A persistent cough may be a sign of a serious condition. 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 immediately. Do not use if imprinted seal under cap is broken or missing.