Previous tests in rabbits have shown that the procedure is easily reversible by dissolving the gel using ultrasound.
The product showed real promise as an alternative to vasectomy because research in rabbits has previously shown the product to be reversible.
The researchers selected 16 rhesus monkeys for the surgery, 10 of which had already sired offspring. They were then monitored closely to ensure a healthy recovery before being placed back into their housing groups, which included adult fertile females.
They were monitored for a breeding season of about six months and the authors found that no pregnancies occurred during that time. The expected pregnancy rate for sexually mature females in normal conditions is about 80%.
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Unfortunately, there is not a huge amount of funding or a sense of urgency going into developing male contraceptives. Apparently, the side effects such as depression, acne, and hormone imbalances are considered too high, despite these all being accepted side effects of current female hormone-based contraceptions readily available in the market and even prescribed by doctors.
Unlike vasectomies, where the tubes are cut and tied, making it harder to reverse, the gel theoretically should be easily reversible using ultrasound, though this has only been tested in rabbits and not on monkeys.