Male Birth Control
In a recent study, cosponsored by the United Nations, the novel hormonal birth control shot was found to be 96% effective at preventing pregnancy. The injection, which is given every eight weeks, contains 1,000 miligrams of exogenous testosterone and 200 milligrams of noresthisterone, resulting in reversible hormonal suppression of spermatogenesis. The study occurred between 2008 and 2012, however researchers decided to stop the study in 2011, earlier than planned, because of the rate of reported side effects. In total, 1,491 adverse events were reported by subjects, the most common being acne, increased libido, pain at injection site, muscle pain, and mood disorders. Twenty couples dropped out of the study because of adverse symptoms.
Sources:
http://www.cnn.com/2016/10/30/health/male-birth-control/
http://press.endocrine.org/doi/pdf/10.1210/jc.2016-2141