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Hormonal conditions
Testosterone drives desire in every body, not only in men, and low levels flatten desire, slow arousal, reduce morning erections, and produce a fatigue people usually blame on age. It matters clinically because it is rarely the whole story — it is often the downstream consequence of long-term opioid use, of an enzyme-inducing antiseizure medicine, of sleep apnoea, or of raised prolactin, each of which is its own findable cause.
See someone about this if
Editorial categories, not percentages, and never a prediction about you. Each links to the fuller picture of that change.
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.
Sex stops happening because there is nothing left in the tank by the time there is an opportunity. A real medicine effect, not a motivation problem.
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.
Arousal works but orgasm does not arrive. When this starts within weeks of a new medicine and had never happened before, the timing itself is information.
Condition or treatment?
The classes listed here are causes rather than treatments: each of them suppresses testosterone or blocks its effect. That is the point — a low result is a finding to explain, not an endpoint, and the explanation is frequently already in the medicine cabinet.
For almost every condition on this site, the condition and the medicines that treat it both affect sex — by different mechanisms, on different timescales, and with different answers. Being able to say which half you are asking about is the single most useful thing you can bring to an appointment, and it is the thing patients are least often given.
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.
Testosterone drives desire in every body, not only in men, and low levels flatten desire, slow arousal, reduce morning erections, and produce a fatigue people usually blame on age. It matters clinically because it is rarely the whole story — it is often the downstream consequence of long-term opioid use, of an enzyme-inducing antiseizure medicine, of sleep apnoea, or of raised prolactin, each of which is its own findable cause.
The effects reported most often are lower sexual desire, difficulty getting or keeping an erection, and fatigue or sedation getting in the way. Reported does not mean inevitable — the picture varies a great deal between people, and most people have more than one thing contributing at once.
The classes listed here are causes rather than treatments: each of them suppresses testosterone or blocks its effect. That is the point — a low result is a finding to explain, not an endpoint, and the explanation is frequently already in the medicine cabinet. Timing is the most useful clue you have: an effect that appeared within weeks of starting or changing a treatment points at the treatment, while one that predates it points at the condition. Never stop, pause, or change a prescribed treatment to find out — take the timeline to the person who prescribed it.
The classes commonly used here that carry documented sexual effects are opioid pain medicines, antiseizure medicines, anti-androgen medicines, gnrh analogues, and antipsychotic medicines. Each has its own profile, so which one you are on matters — and that is a prescribing conversation, never a reason to stop anything.
Ask for the test to be done in the morning, when levels are highest — a late-afternoon sample can read low in someone perfectly normal. Sleep apnoea treatment raises testosterone in people who have it, and it is heavily under-diagnosed.
Sooner than most people do, and specifically without waiting: A low result should always prompt a search for the cause rather than immediate replacement — the cause is often treatable on its own.
Educational information about what a diagnosed condition tends to do — not a diagnosis, not a way to work out whether you have something, and not advice about your treatment. Conditions on this page overlap, and most people with a long-term condition have more than one thing affecting them at once. Nothing here can examine you or run a test. Pain, bleeding, or a new and unexplained symptom always deserves assessment.