Do not use if seal at base of cap is broken or missing.
Ask a doctor before use if you have
Cough that occurs with too much phlegm (mucus)
Cough that last 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 is accompanied by fever, rash, or a persistent headache. These could be a sign of a serious condition.