Injectable birth control for men is closer to becoming reality, but researchers are putting their trial on hold for now, due to too many side effects. Those side effects included depression and other mood disorders.
Researchers recruited 320 volunteers from around the world for the study. The men were 18 - 45 years old and were in long-term relationships with one woman partner. The volunteers were given two injections of the hormonal birth control every 8 weeks. After 24 weeks the majority of the men had low sperm counts, down to less than 1 million per milliliter of semen. Once the injections stopped, scientists found sperm counts went back to normal levels after some time.
Medscape reports the failure rate of the birth control was 7.5 percent, while U.S. health officials say male condoms have a 12 percent failure rate.