If symptoms worsen or are accompanied by a high fever (>38° C) or the production of thick, yellow/green phlegm, talk to a doctor.
ca Pharmacist.. Consult a doctor before use with other medications, including natural health products, prescription drugs, non-prescription drugs, or if you have chronic alcoholism, serious kidney or liver disease, high blood pressure, heart or thyroid disease, diabetes, chronic lung disease, shortness of breath, asthma, glaucoma, an enlarged prostate, or are elderly, pregnant, or breastfeeding.