metformin Publications Environmental risk assessment of metformin and its transformation product guanylurea II Part II. Occurrence in surface waters of Europe and the United States and derivation of predicted no-effect concentrations Environmental risk assessment of metformin and its transformation product guanylurea II More information on Medical Devices Environmental risk assessment of metformin and its transformation product guanylurea I Part I. Environmental fate Environmental risk assessment of metformin and its transformation product guanylurea I More information on Medical Devices