Never stop, pause, reduce, or change a prescribed medicine because of anything on this page. Some of the medicines listed here are dangerous to stop suddenly, and the condition being treated does not pause while you experiment. Everything here exists to make your next conversation with a prescriber more specific — not to replace it.
Frequently reportedCancer treatment
Anti-androgen medicines and sexual side effects
These stop testosterone acting on tissue, so reduced desire and erection difficulty are expected effects rather than unwanted surprises. Breast tenderness and enlargement are common. They are prescribed in prostate cancer care and, in some settings, for other conditions — the effect on desire is the same either way.
What the rating means: Sexual effects are among the better-documented effects of this class. Frequent does not mean inevitable — plenty of people take these with no change at all.
What is reported
Editorial categories, not percentages. Published rates vary enormously depending on study design and on whether anyone thought to ask the question.
Wanting sex less often, or losing the spontaneous interest that used to arrive on its own. This is the effect people most often assume is psychological and most often is not only psychological.
Erections that are slower, softer, or do not hold. Because this depends on blood vessels and nerves, it can also be an early signal of something cardiovascular — which is why it is worth a clinical conversation rather than only a product.
The body responds less, or much more slowly, even when the interest is there. Blood flow, nerve signalling, and hormone levels all feed this, and medicines can act on any of the three.
Much less fluid, no fluid at all, or ejaculation that goes backwards into the bladder. Alarming the first time it happens and, with some classes, an expected and harmless mechanical effect.
Timing and reversibility
Effects appear over weeks and persist while treatment continues. Some recovery after treatment ends is common but is neither guaranteed nor quick.
Frequently reported for this class. These stop testosterone acting on tissue, so reduced desire and erection difficulty are expected effects rather than unwanted surprises. Breast tenderness and enlargement are common. They are prescribed in prostate cancer care and, in some settings, for other conditions — the effect on desire is the same either way.
Which sexual side effects are most reported with anti-androgen medicines?
The effects reported most often are lower sexual desire, difficulty getting or keeping an erection, and arousal is slower or harder to reach. Reported does not mean guaranteed — plenty of people take these medicines with no change at all, and published rates vary widely depending on whether anyone asked the question.
How soon would anti-androgen medicines cause a change, and does it reverse?
Effects appear over weeks and persist while treatment continues. Some recovery after treatment ends is common but is neither guaranteed nor quick.
What should I do if I notice this while taking anti-androgen medicines?
No. Never stop, pause, or reduce a prescribed medicine on your own because of a side effect — several medicines on this site are dangerous to stop suddenly, and the condition being treated does not pause while you experiment. Bring the observation to the person who prescribed it; a dose review, a different preparation, or a different approach may all be options, and only they can weigh them against what the medicine is doing for you.
What should I ask about anti-androgen medicines at my appointment?
A specific question gets a better answer than a general one. For this class: What sexual rehabilitation support does my service offer? Is a referral to a psychosexual or survivorship service available? What has been seen in terms of recovery after treatment for people in my situation?
When is this worth an appointment rather than a wait-and-see?
Sexual rehabilitation is a recognised part of prostate cancer care and is routinely under-offered. Asking for it by name is often what unlocks it.
Educational information about categories of medicine only — not medical advice, not a diagnosis, and not a statement about your prescription. It does not cover doses, interactions between medicines, or alternatives, and it cannot know what else is going on with your health. Sexual symptoms often have more than one cause at once. Pain, bleeding, or a symptom that is new and unexplained always deserves assessment.