Early tests in mice look promising for a non-hormonal, on-demand pill that immobilises sperm.
The effect lasted for around three hours. By 24 hours, it appeared to have fully worn off.
If it does ultimately work in humans, men might be able to take it only when, and as often, as needed. They could make day-to-day decisions about their fertility. Prof Allan Pacey, professor of andrology at the University of Sheffield, said: "There is a pressing need for an effective, reversible, oral contraceptive for men and although many different approaches have been tested over the years, none has yet reached the market.
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