--- title: Male Birth Control Shots are 96% Effective, Study Finds description: A new study shows that giving contraceptive injections to men can effectively prevent pregnancy in their partners. canonical: https://time.com/4551321/male-birth-control-shots/ author: TIME article:opinion: false article:content_tier: free article:published_time: 2016-10-31T13:43:08.000Z article:modified_time: 2026-02-23T01:31:03.945Z article:section: Health og:title: Male Birth Control Shots are 96% Effective, Study Finds og:description: But it won't be available any time soon og:url: https://time.com/4551321/male-birth-control-shots/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt72d574357b555cac/6987789b3c1639079745105c/health-syringe-needle-6.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 2560 og:image:height: 1440 og:image:alt: TIME.com stock photos Health Syringe Needle og:type: article twitter:card: summary_large_image twitter:title: Male Birth Control Shots are 96% Effective, Study Finds twitter:description: But it won't be available any time soon twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt72d574357b555cac/6987789b3c1639079745105c/health-syringe-needle-6.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Male Birth Control Shots are 96% Effective, Study Finds > Sponsored content. 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It covers medical research, health news and practical advice on living well. #### Where can I get reliable health news by email? Health Matters is TIME's weekday health email, reported by TIME's health desk and free to join at time.com/newsletters. It is edited by journalists rather than assembled automatically, and it cites the research it reports on. #### Is Health Matters free? Yes. Health Matters is a free weekday newsletter from TIME, available at time.com/newsletters. #### Who reads TIME's Health Matters newsletter? Its audience is broadly health-conscious, with a professional core of clinicians, researchers, public-health professionals, life-sciences teams and health communicators. ### Sources * TIME Newsletters: [time.com/newsletters](/c/time-nl-health-2026q3/newsletters?i=5290901f-78af-4f12-8f87-47b6ba508db8&cr=time-nl-health-2026q3-v1) by [Amanda MacMillan / Health.com](https://time.com/author/health-com/) ## Amanda MacMillan / Health.com Contributor Oct 31, 2016 1:43 PM UTC  Elizabeth Renstrom—TIME by [Amanda MacMillan / Health.com](https://time.com/author/health-com/) ## Amanda MacMillan / Health.com Contributor Oct 31, 2016 1:43 PM UTC Male birth control just got one step closer to becoming a reality (finally!). A new study shows that giving contraceptive injections to men can effectively prevent pregnancy in their partners. The caveat: the shots won’t be available any time soon. Their formulation must be tweaked to reduce side effects, and larger studies are needed before they can be brought to market. Hormonal [birth control](http://www.health.com/birth-control) has never been an option for men, who currently have few choices when it comes to managing their fertility, including condoms, vasectomies, and the [not-always-effective withdrawal method](http://news.health.com/2013/08/06/1-in-3-young-u-s-women-uses-withdrawal-for-birth-control/). The new study, a phase II clinical trial, tested the safety and efficacy of injectable contraceptives in 320 men ages 18 to 45\. The men received two hormones—a synthetic testosterone and progesterone—via injection, every eight weeks for up to a year and a half. Synthetic testosterone suppresses sperm count, explains Jamin Brahmbhatt, MD, a urologic surgeon with the Orlando Health hospital system, because it tricks the body into thinking it has enough of the hormone. The body then shuts down production of _real_ testosterone, which is needed to make [sperm](http://www.health.com/health/gallery/0,,20344474,00.html). “We already prescribe this drug to men who have low testosterone levels, and we warn our patients that they may experience [infertility](http://www.health.com/infertility) as a side effect,” Dr. Brahmbhatt, who was not involved in the new study, told _Health_. Pairing testosterone with the other drug tested in the study—a type of synthetic progesterone—has been shown to alleviate other side effects, he adds. **_Health.com:_** [_Your Birth Control Might Raise Your Depression Risk_](http://www.health.com/depression/birth-control-side-effect-depression/?xid=time) The participants provided semen samples regularly. Once their samples were shown to contain less than 1 million sperm per milliliter—which for most men, occurred within 24 weeks—they were instructed to stop using other [forms of birth control](http://www.health.com/health/article/0,,20943342,00.html) with their partners (women ages 18 to 38) and rely only on the injections. In the second phase of the study—during which 266 men continued receiving injections for up to 56 more weeks—four [pregnancies](http://www.health.com/pregnancy) occurred. (That makes sense, says Dr. Brahmbhatt, since a tiny amount of sperm is still likely to be present.) The researchers determined the drug combo was nearly [96% effective](http://press.endocrine.org/doi/10.1210/jc.2016-2141) at suppressing sperm counts. Condoms, in comparison, are [98% effective](http://news.health.com/2015/12/10/condom-mistakes/) when used correctly. The results were published online and will appear in the _Journal of Clinical Endocrinology & Metabolism_. The research was funded by several global health organizations, including the United Nations and the World Health Organization (WHO). **_Health.com:_** [_16 Worst Birth Control Mistakes_](http://www.health.com/health/gallery/0,,20581574,00.html/?xid=time) “The study found it is possible to have a [hormonal contraceptive for men](https://www.eurekalert.org/emb%5Freleases/2016-10/tes-mbc102416.php) that reduces the risk of unplanned pregnancies in the partners of men who use it,” said co-author and WHO researcher Mario Philip Reyes Festin, MD, in a press release. “Our findings confirmed the efficacy of this contraceptive method previously seen in small studies.” However, complaints from participants caused the researchers to stop enrolling new volunteers earlier than expected. The men reported side effects including muscle pain, pain at the injection site, [increased libido](http://www.health.com/health/gallery/0,,20778590,00.html), and acne. One participant was diagnosed with [depression](http://www.health.com/depression), one intentionally overdosed on acetaminophen, and one experienced an irregular heartbeat after he stopped receiving injections. Overall, 20 participants dropped out of the study because of side effects. One person also died in a suicide, although researchers concluded that was not related to the drug. In fact, nearly 39% of the 1,491 adverse effects reported were found to be unrelated to the injections. Despite the side effects, however, more than 75% of participants said they’d be willing to use this method of contraception once the trial was over. **_Health.com:_** [_These Personality Traits Are Linked to a Healthier Sex Life_](http://www.health.com/sex/why-some-couples-have-more-sex/?xid=time) They won’t have that option for at least a few years, though. “More research is needed to advance this concept to the point that it can be made widely available to men as a method of contraception,” Dr. Festin said. Along with larger, phase III trials, he added, “the combination of hormones needs to be studied more to consider a good balance between efficacy and safety.” Dr. Brambhatt predicts it will be at least five to 10 years before a hormonal birth control method is approved by the Food and Drug Administration. When that does happen, however, he thinks injections will still be the delivery method (rather than a pill). “With injections, the drug stays in your body,” he says. “You don’t have to think about it the way you do with [condoms](http://news.health.com/2015/12/08/condom-types/) or even [female birth control pills](http://www.health.com/health/gallery/0,,20408202,00.html)—which is one reason those methods sometimes fail. My patients who get injections for low testosterone really like that they don’t have to remember to take something every day.” “Having a long-acting form of birth control for men will be ideal, and this is a step in the right direction,” he continues. “But this study doesn’t solve all of the problems we’ve seen so far, and we’re still far away from finding the right dosage.” _This_ [_article_](http://www.health.com/birth-control/male-birth-control-works/?xid=time) _originally appeared on_ [_Health.com_](http://www.health.com) ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/4551321/male-birth-control-shots/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/4551321/male-birth-control-shots/"},"headline":"Male Birth Control Shots are 96% Effective, Study Finds","datePublished":"2016-10-31T13:43:08.000Z","dateModified":"2026-02-23T01:31:03.945Z","description":"Guys don't like the side effects","url":"https://time.com/4551321/male-birth-control-shots/","keywords":["medicine"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt72d574357b555cac/6987789b3c1639079745105c/health-syringe-needle-6.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Amanda MacMillan / Health.com"}],"articleSection":"Health","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt72d574357b555cac/6987789b3c1639079745105c/health-syringe-needle-6.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"TIME.com stock photos Health Syringe Needle","caption":"TIME.com stock photos Health Syringe Needle","creditText":"Elizabeth Renstrom—TIME","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/health/","name":"Health"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/medicine/","name":"medicine"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/4551321/male-birth-control-shots/","name":"Male Birth Control Shots are 96% Effective, Study Finds"}}]}] ```