in children who have chronic pulmonary disease, shortness of breath, or who are taking other drugs unless directed by a doctor; for persistent or chronic cough such as occurs with asthma or if cough is accompanied by excessive phlegm (mucus) unless directed by a doctor
before use if you or your child has glaucoma; a breathing problem such as emphysema or chronic bronchitis
if you or your child are taking sedatives or tranquilizers
cough 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.