Stop use and ask a doctor if new symptoms occur, symptoms worsen or do not get better within 7 days. fever worsens or lasts more than 3 days. cough lasts more than 7 days or occurs with rash or persistent headache. These could be signs of a serious condition. Warnings Sore throat warning: severe or persistent sore throat for more than 2 days or if accompanied by high fever, headache, nausea, vomiting or rash may be serious. Consult a physician promptly. Ask a doctor before use if you have a persistent or chronic cough that lasts, is chronic such as occurs with smoking, asthma, chronic bronchitis or emphysema or is accompanied by excessive phlegm (mucus). If pregnant or breast-feeding, ask a healthcare professional before use. Keep out of reach of children. In case of overdose, seek medical help or contact a Poison Control Center immediately.