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29 Jul 2011 08:35 AM

Environmental Effect Of Pharmaceutical Products Predicted By New Model


Most synthetic chemical products used in consumer goods end up unchanged in the environment. Given the risks this could pose for the environment and human health, researchers from the Autonomous University of Barcelona (UAB) have developed a new tool to effectively predict what will happen to current and future pharmaceutical products.



Thousands of pharmaceutical products, which are increasingly diverse and increasingly used, are "partially" metabolised by the human body. Those that remain unchanged pass into the waste water treated at sewage plants, which are not always designed to eliminate synthetic organic compounds.



"Sometimes, some substrates can even revert to the original drug within the water treatment plant itself, increasing the concentration of the drug in the effluent discharged, as is the case with carbamazepine (a psychotropic anti-epilepsy drug)", Xavier Domenech, co-author of the study and a researcher at the Department of Chemistry of the UAB, tells SINC.



The result is that a great variety of drugs that could be harmful to wildlife end up in the environment. "This is of greater concern in the case of water treated for human consumption, in which we are increasingly detecting a cocktail of drugs at low concentrations (nanograms per litre), the long-term effect of which is unknown", explains Domenech.



Pinpointing the effect of a drug




The study, which has been published in Water Air and Soil Pollution, has made it possible to develop a new tool to determine the likelihood of drugs ending up in the environment, and at what concentrations, thereby fulfilling the European Medicines Agency (EMEA) requirement to evaluate the environmental risk of new drugs that are being proposed for marketing.



The new tool, developed by Marc Ribera, lead author of the study, uses some physical-chemical properties of pharmaceuticals and the rate of growth in their use in Spain between 1999 and 2006 to determine...
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