4-aminopyridine Treatment for Nerve Injury

This trial is testing whether a drug called 4-aminopyridine (4-AP), which helps injured nerves recover, can help men regain erectile function after prostate cancer surgery that is intended to preserve the nerves controlling erections (nerve-sparing radical prostatectomy). **You may be eligible if...** - You are a man between 45 and 75 years old - You have been diagnosed with early-stage prostate cancer (stages T1c to T2c) that has not spread - You are scheduled to have robot-assisted nerve-sparing radical prostatectomy - Your PSA level is less than 15 ng/mL - You have had regular sexual activity and normal erectile function (IIEF-5 score of 17 or higher) in the past 3 months - You are willing to avoid other erectile dysfunction treatments for 3 months after surgery **You may NOT be eligible if...** - You have advanced prostate cancer (stage T3 or above) or cancer that has spread to lymph nodes - You need additional treatment (radiation or hormone therapy) after surgery - You have a history of seizures, multiple sclerosis, stroke, or other neurological disorders - You have kidney problems (GFR below 60 mL/min) - You are allergic to 4-aminopyridine - You have had penile surgery (other than circumcision) Talk to your doctor to see if this trial is right for you.