The short answer
Erectile dysfunction after cancer is common and often treatable. It deserves direct discussion, not embarrassment.
Erectile Dysfunction After Cancer Treatment is a planning topic, not a diagnosis or treatment instruction by itself.
The next step depends on cancer type, report wording, symptoms, prior results, and treatment goals.
Ask what this changes about the plan, what is still pending, and what time frame matters.
On this page
Choose how you want to read this
The whole article, with every detail and caution.
This page is for men who have trouble with erections after cancer treatment, and for their partners. It explains how treatments can cause the problem and what to ask your team.
How an erection works, and how treatment can interfere
An erection depends on nerves and blood vessels working together. Testosterone, the main male hormone, supports sex drive. Erectile dysfunction (ED) means trouble getting or keeping an erection. The National Cancer Institute (NCI) says that "if blood vessels or nerves are damaged, it may be difficult to get or keep an erection." Cancer treatment can affect more than one of these parts. The useful first question is "what caused it in my case?" The answer changes the fix.
Matching the damage to the treatment
Pelvic surgery can injure nerves. NCI says surgery for penile, rectal, prostate, testicular, and other pelvic cancers "may affect the nerves, making it difficult to get and keep an erection." NCI adds that "sometimes nerve-sparing surgery can be used to prevent these problems." On its prostate page, NCI says nerve-sparing may not be possible "in men with large tumors or tumors that are very close to the nerves." Ask your surgeon before surgery whether sparing the nerves is an option for you.
Radiation can affect sexual function. NCI says external-beam radiation to the pelvis "can affect a man's sexual function." Its prostate page says radiation "can cause impotence and urinary problems that may get worse with age." Ask what to expect over time, not just in the first months.
Hormone therapy lowers testosterone. NCI says hormone therapy "can lower testosterone levels and decrease a man's sexual drive. It may be difficult to get or keep an erection." For prostate cancer, NCI lists hot flashes, impaired sexual function, loss of desire for sex, and weakened bones among its effects.
Chemotherapy. NCI states that chemotherapy "may lower your testosterone levels and libido during the treatment period."
Your other medicines count. NCI says "medicines used to treat pain, some drugs used for depression, as well as medicines that affect the nerves and blood vessels may all affect your sex drive." Bring your whole medicine list, including anything you buy without a prescription.
Treatment options to ask about
Your team can talk through options. Which ones fit depends on your cancer, your treatment, and your other health conditions.
Pills such as sildenafil and tadalafil. MedlinePlus says the best time to take sildenafil is about 1 hour before sexual activity, though it can be taken "any time from 4 hours to 30 minutes before." It should not be taken more than once in 24 hours unless your doctor directs otherwise. MedlinePlus says tadalafil is sometimes taken as needed, "usually at least 30 minutes before sexual activity and not more often than once every 24 hours." Do not change how you take these without your doctor's advice.
Penile implant. NCI describes a surgical procedure in which "a firm rod or inflatable device (penile implant) is placed in the penis, making it possible to get and keep an erection."
Other options exist. Ask your team, or a urologist or sexual medicine clinic, what else could suit you. If a pill did not work, that is information, not a verdict. Ask what the next step is.
Get help now
Go to an emergency department right away for an erection that is painful or lasts longer than 4 hours. MedlinePlus lists this as a possible emergency for both sildenafil and tadalafil. Call 911 if you cannot get there safely. Do not wait for it to go away.
Never take these pills with nitrates. MedlinePlus names isosorbide dinitrate (Isordil), isosorbide mononitrate (Monoket), and nitroglycerin, and says street drugs called "poppers" must also be avoided. Tell every doctor and pharmacist you see that you take one of these pills.
Sudden loss of vision, or sudden loss of hearing, needs urgent care. MedlinePlus says to call your doctor right away or get emergency medical treatment if this happens while taking these drugs. Chest pain, fainting, or trouble breathing also need emergency help: call 911.
What to ask, and who to ask
NCI suggests these questions: "What sexual problems are common among men receiving this treatment? How long might these problems last? Will any of these problems be permanent?" Add three more. What do you think is causing mine? Should I see urology or a sexual medicine clinic rather than manage this in oncology? If I am on hormone therapy, is an ED pill the right tool right now?
Related pages
See also Sexual Health and Cancer, Cancer and Fertility, and Fertility Preservation Before Cancer Treatment.
Sources
Common questions
Does this page tell me what treatment I should get?
No. It explains the topic in plain language so you can ask better questions. Your care team applies it to your diagnosis, test results, and goals.
What should I bring to the appointment?
Bring the report or letter, your medicine list, recent results, and a written list of questions. Ask what result or decision is still pending.
When should I call sooner?
Call promptly for severe, rapidly worsening, or treatment-specific warning symptoms, or whenever your care team has told you not to wait.
Questions to ask your doctor
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Your next step
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Sources last checked: 2026-07-21 what this meansLast updated: 2026-10-02Next planned review: 2028-07-21
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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