The experimental male oral contraceptive is called 11-beta-methyl-19-nortestosterone dodecylcarbonate, or 11-beta-MNTDC. It is a modified testosterone that has the combined actions of a male hormone (androgen) and a progesterone, said the study’s co-senior investigator, Christina Wang, M.D., Associate Director, Clinical and Translational Science Institute at Los Angeles Biomed Research Institute (LA BioMed), Torrance, California.

"Our results suggest that this pill, which combines two hormonal activities in one, will decrease sperm production while preserving libido," Wang said.

The study took place in 40 healthy men at LA BioMed and the University of Washington in Seattle, Washington. Among men receiving 11-beta-MNTDC, the average circulating testosterone level dropped as low as in androgen deficiency, but the participants reportedly did not experience any severe side effects. Wang said drug side effects were few, mild and included fatigue, acne or headache in four to six men each. Five men reported mildly decreased sex drive, and two men described mild erectile dysfunction, but sexual activity was not decreased, she said. Furthermore, no participant stopped taking the drug because of side effects, and all passed safety tests.

Effects due to low testosterone were minimal, according to co-senior investigator, Stephanie Page, M.D., Ph.D., Professor of Medicine at the University of Washington School of Medicine, because "11-beta-MNTDC mimics testosterone through the rest of the body but is not concentrated enough in the testes to support sperm production."

Levels of two hormones required for sperm production dropped greatly compared to placebo, the researchers found. The drug effects were reversible after stopping treatment, Wang noted.

Because the drug would take at least three 60 to 90 days to affect sperm production, 28 days of treatment is too short an interval to observe optimal sperm suppression, Wang explained. They plan longer studies, and if the drug is effective, it will move to larger studies and then testing in sexually active couples.

"Safe, reversible hormonal male contraception should be available in about ten years," Wang predicted.

Wang said most men are open to using this type of male birth control. She cited a multinational survey of 9,000 men published in the journal Human Reproduction in February 2005 that found that 55 percent of men in stable relationships want to try new, hormonal male contraceptive methods if they are reversible.

This experimental contraceptive, 11-Beta-MNTDC, is a "sister compound" to dimethandrolone undecanoate, or DMAU, the first potential male birth control pill to undergo testing by the same research team. Their results were published in February 2019 in The Journal of Clinical Endocrinology and Metabolism.

"The goal is to find the compound that has the fewest side effects and is the most effective," Page said. "We are developing two oral drugs in parallel in an attempt to move the [contraceptive medicine] field forward."

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