The active metabolite oseltamivir carboxylate (OC) of the popular anti-influenza drug Tamiflu (oseltamivir phosphate), was measured by a team in samples of sewage discharge and river water collected near Kyoto City during japan's 2008-2009 flu season.rnThe scientists, from Kyoto University, already knew that OC withstands the activated sludge treatment process used by many sewage treatment plants (STPs) and that the metabolite is released in STP wastewater, but the amount of OC reaching waterways as a result of this had not been measured.
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