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Not being able to get or keep an erection after treatment, because the nerves, the blood supply or the testosterone have been affected.
Surgery can remove or damage the erectile nerves that run alongside the prostate; radiotherapy damages the blood supply more slowly; hormone therapy removes the desire and the erections with it. NICE NG131 sets out a ladder: PDE5 inhibitor tablets first, then vacuum devices, intraurethral inserts, penile injections or a penile prosthesis, with access to specialist erectile dysfunction services and psychosexual support alongside. All of it is free on the NHS and there is no age limit.