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This is Dr David
how old are you? age is an independent risk factor to cause erectile dysfunction after TURP.
have you had your blood testosterone levels checked?
usually TRIMIX or intracorpuscular injections of alprostadil will cause erections even if the nerves to the penis are damaged.
have you tried to use a penile vacuum pump with a soft silicone or rubber ring at the base of the penis to get an erection?