Injection of sex hormones in males lowered sperm counts to less than 1 million per milliliter or less in 274 of 320 men after 24 weeks. This male birth control shot was found to be effective in nearly 96% of users. Side effects included mental depression, mood changes and increased libido. Twenty men dropped out of the study because of side effects such as heart palpitations, high blood pressure and erectile dysfunction. [Medical News Today Oct 28, 2016] This is not ready for prime time regardless of whatever positive news you may read.