Sore th?oat warning: If sore throat is severe, persists more than 2 days, is accompanied or followed by fever, headache, rash, swelling, nausea, or vomiting, consult a doctor promptly. Ask a doctor before use if you have: persistent or chronic cough as o?curs with smoking, asthma or emphysem?. cough that occurs with excessive phlegm (mucus). Stop use and ask a doctor if: cough persists for more than 1 week, tends to recur, or is accompanied by fever, rash or persistent headache. A persistent cough may be a sign of a serious condition. sore mouth symptoms do not improve in 7 days. If pregnant or breast-feeding, ask a health professional b?fore use. Keep out of reach of children.