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Dehydronifedipine is the main metabolite of the pharmaceutical Nifedipine, a pharmaceutical taken to treat high blood pressure and angina (chest pain).[1] Dehydronifedipine has been found in sewage sludge.

As a Pollutant

Because humans and animals often do not fully metabolize pharmaceuticals in their body, they can excrete drugs or their breakdown products, which may the enter the environment.[2]

In Sewage Sludge

Dehydronifedipine has been found in sewage sludge. In the Targeted National Sewage Sludge Survey, a 2009 test of 84 samples of sewage sludge from around the U.S., the EPA found dehydronifedipine in 19 samples (23%) in concentrations ranging from 3.48 to 24.6 parts per billion.[3] There are no federal regulations governing how much of this drug may be present in sewage sludge applied to land as fertilizer.

In Drinking Water

An Associated Press investigation found that, of 62 metropolitan areas in the U.S., only 28 tested for pharmaceuticals, and 24 found pharmaceuticals in the drinking water when they tested it.[4] Of those tested, Northern New Jersey and Tucson, AZ both tested positive for dehydronifedipine.[5]

Articles and resources

Related SourceWatch articles


  1. Streel B, Zimmer C, Sibenaler R, Ceccato A, "Simultaneous determination of nifedipine and dehydronifedipine in human plasma by liquid chromatography-tandem mass spectrometry", Journal of chromatography. B, Biomedical sciences and applications, December 1998.
  2. O.A.H. Jones, N. Voulvoulis, and J.N. Lester, Human Pharmaceuticals in Wastewater Treatment Processes, Environmental Science and Technology, 2005.
  3. Targeted National Sewage Sludge Survey Report, US EPA website, Accessed August 28, 2010.
  4. AN AP INVESTIGATION : Pharmaceuticals Found in Drinking Water, Associated Press, Accessed September 3, 2010.
  5. Pharmawater-Metros-By-Results, Associated Press, Accessed September 3, 2010.

External resources

External articles