Male Contraceptive Method:
RISUG (Reversible Inhibition of Sperm Under Guidance): a reversible, nonhormonal contraceptive that provides 10 or more years of protection after a 10-15 minute procedure. Researchers received approval this week to begin enrolling additional study volunteers, after a delay of nearly four years. In the RISUG study, doctors inject a gel into the tube that sperm travel through after they are produced (known as the vas deferens). The gel then disables the sperm as they swim by. In study animals, male fertility returns if the RISUG is flushed out with another injection that dissolves the gel.
In 2002, when enrollment in the Indian study was halted, more than 140 men were already using RISUG. Concern about side effects and insufficiency of safety data caused a temporary suspension of the project. However, expert panels subsequently concluded that the major side effect -- several weeks of non-painful scrotal swelling in about a third of the subjects --was not enough to stop the study.
Currently, RISUG's developers (ICMR, India and affiliated researchers) are arranging a collaboration with US researchers. Lissner says that to gain FDA approval, US researchers will have to begin with animal tests, so studies in North American men would not start for several years.
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Abstract from EurekAlert! 30 March 2006 post
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Other useful links on current research in contraception:
http://www.malecontraceptives.org/methods/risug.php
http://www.mcip.info/
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