Now couples can look forward to a male contraceptive injection that is as effective as a female birth control pill. 1,045 fertile, healthy Chinese males were injected monthly with 500 mg of a drug, testosterone undecanoate, for 30 months. Results showed 99 out of every 100 males failed to get their partners to conceive. This drug temporarily blocks sperm production. No adverse effects were found and the subjects returned to normal fertility as the drug's efficacy wore out. The long-term effects are yet to be studied, said the report in the May 4 issue of the Journal of Clinical Endocrinology and Metabolism.

Source: Down To Earth,
Date: June, 2009