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An erection that will not go down: after four hours it is an emergency, because the tissue starts to be damaged.
It is rare, affecting fewer than 1 in 100 men using treatments for erection problems and about 1 in 100 using injections. Prostate Cancer UK says to try walking, squatting, passing urine or a cold pack first, and to go to the nearest accident and emergency department straight away if the erection lasts more than four hours. It also says not to use PDE5 tablets and injections together, because that raises the risk.
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