Pharmaceuticals is a term for chemicals (both natural and synthetic) that exist in a variety of drugs, for example, prescription and over-the-counter drug as well as veterinary medicine. Pharmaceuticals penetrate surface water and drinking water through raw sewage and wastewater discharges. Consumption of water with a low concentration of pharmaceuticals is extremely unlikely to cause any significant adverse health impacts on humans. Some advanced water treatment processes target specific pharmaceuticals compounds and can achieve high removal rates (above 99%), namely, ozonation, advanced oxidation, activated carbon and membranes (e.g. nanofiltration, reverse osmosis).