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Contraception. 1997 Oct;56(4):245-50.

Phase II clinical trial of a vas deferens injectable contraceptive for the male.

Author information

  • 1Centre for Biomedical Engineering, Indian Institute of Technology and All India Institute of Medical Sciences, New Delhi, India. guhask@giasd101.vsnl.net.in

Abstract

Following up on an earlier clinical trial demonstrating the safety of an intra-vas deferens injection of a contraceptive drug named Risug, comprised of styrene maleic anhydride (SMA) in a solvent vehicle of dimethylsulphoxide (DMSO), a study to assess the contraceptive effectiveness of a specific dose (60 mg) of SMA bilaterally was planned and implemented. Male subjects and their wives with normal reproductive profiles were the volunteer subjects. The wives were not using any contraceptives. The results reconfirm the safety and show that for a period of at least 1 year, the treatment leads to azoospermia in the male and gives pregnancy protection.

PIP:

A Phase I clinical trial documented the safety of an intra-vas deferens injection of a contraceptive agent (Risug) containing up to 140 mg of styrene maleic anhydride (SMA) in a solvent vehicle of dimethylsulfoxide. This Phase II study sought to determine whether a single injection of a fixed dose of SMA into the lumen of the vas deferens controls fertility for a period of at least 12 months. 12 male subjects whose wives were not using a contraceptive method were administered 60 mg of SMA bilaterally. This regimen produced sustained azoospermia in all 12 subjects, with no changes in other parameters over the course of the 12-month study period. Spermatozoa all along the length of the vas deferens appeared to be inactivated immediately following injection. No pregnancies were reported. The findings confirm the safety of this method and indicate that the treatment leads to azoospermia for at least 1 year.

PMID:
9408706
[PubMed - indexed for MEDLINE]
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