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 drug.
heart disease
high blood pressure
thyroid disease
diabetes
glaucoma
trouble urinating due to an enlarged prostate gland
a breathing problem such as emphysema or chronic bronchitis
a cough that lasts or is chronic such as occurs with smoking, asthma or emphysema
a cough that occurs with too much phlegm (mucus)
taking any other nasal decongestant or stimulant
taking sedatives or tranquilizers
nervousness, dizziness, or sleeplessness occur.
cough or nasal congestion persists for more than 1 week, tends to recur, or is accompanied by a fever, rash or persistent headache. These could be signs of a serious condition.