Few of the male monkeys had side-effects, although one did need an operation because the injection did not go to plan and damaged one of his tubes. Trials in humans and more long-term safety data are required before we will know if it is a success. If approved to be tested in men and possibly validated after tests, Vasalgel will be the third option for male control of birth, added to the actual use of condoms or the vasectomy. It meant to offer long-acting contraception. What is different: Vasalgel has the same end effect as vasectomy, but researchers hope it should be easier to reverse if a man later decides he wants to have children. However, there had been very little commercial interest from pharmaceutical companies in this kind of a approach.