Relenza is delivered directly to the lungs by oral inhalation from a Diskhaler device. To benefit from the drug, you must begin taking it within 48 hours of feeling the first symptoms of flu, and must finish the entire 5-day course of treatment.
Be sure to take two doses on the first day, allowing at least 2 hours between them. On the following days, take a dose every 12 hours (morning and evening). Do not puncture a blister containing the drug until you are ready to use it.