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warnings
warning Ask a doctor before use if you have •cough that occurs with too much phlegm (mucus) •cough that lasts or is chronic such as occurs with smoking, asthma, chronic bronchitis, or emphysema Stop use and ask a doctor if cough lasts for more than 7 days, comes back, or occurs with fever, rash, or persistent headache. A persistent cough may be a sign of a serious condition.