Silphen Dm Cough

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 an MAOI, ask a doctor or pharmacist before taking this product. 

• a cough that occurs with too much phlegm (mucus)
• a cough that lasts or is chronic such as occurs with smoking, asthma, chronic bronchitis, or emphysema

cough lasts more than 7 days, comes back, or is accompanied by fever, rash, or persistent headache,. These could be signs of a serious condition.