I had a croupy cough now phlegm, but nothing comes up. been feeling like this for one week. how much longer will this last?

Cough: Some coughs (often viral in cause) may take weeks to resolve. Some suggestions: 1. avoid milk products since that increases mucous production 2. drink lots of fluids but avoid iced drinks for the same reason as #1 above. 3. try to get into shower at least once a day to humidify your bronchial tree and hopefully to help you cough up (expectorate) phlegm. 4. purchase black elderberry