Chronic cough eg, occurs w/ smoking or chronic lung disease eg, asthma or emphysema. Discontinue use if cough lasts >10 days, comes back or if it occurs w/ fever, rash or constant headaches. May produce color interference w/ certain lab determinations of 5-hydroxyindoleacetic acid (5-HIAA) & vanillylmandelic acid (VMA). Pregnancy & lactation. Cap: Contains sorbitol which may have a laxative effect or cause diarrhea.