The first pill to prevent premature ejaculation launches in the U.K. tomorrow.

The drug, taken one to three hours before sex, is shown to make men last three times as long.

It works by altering levels of a chemical in the brain called serotonin, which helps a man to have more control over his moment of climax.

But it is costly — at $116 for a pack of three Priligy 30 mg tablets.

The drug, which is available for men aged 18 to 64, is already on sale in some European countries.

"Priligy has the potential to do as much for men's sexual health as Viagra,” Nitin Makadia, head of male sexual health at one of the U.K.'s leading pharmacies said. "It will give sufferers a chance to improve the quality of their relationships and their general well-being.”

It's estimated that as many as one out of three men may be affected by premature ejaculation at some point. Currently, Priligy is not yet approved for use in the United States.

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