Male contraceptive slows monkey sperm without side effects
In an attempt to develop male contraceptives for humans, American researchers have tested a compound called EP055, which turns-off the sperm's ability to swim after 30 hours of infusion. None of the male monkeys suffered side effects as EP055 does not affect hormones. The sperm's mobility was restored completely within 18 days, suggesting the drug's effects are reversible, said researchers.