MUCUS D (GUAIFENESIN, PSEUDOEPHEDRINE HYDROCHLORIDE) TABLET, MULTILAYER, EXTENDED RELEASE [L. PERRIGO COMPANY] 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. • heart disease • high blood pressure • thyroid disease • diabetes • trouble urinating due to an enlarged prostate gland • persistent or chronic cough such as occurs with smoking, asthma, chronic bronchitis, or emphysema • cough accompanied by too much phlegm (mucus) • you get nervous, dizzy, or sleepless • symptoms do not get better within 7 days, come back or occur with a fever, rash, or persistent headache. These could be signs of a serious illness.