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.
Sometimes reportedOther mental-health medicines
Lithium and sexual side effects
Reduced desire and erection difficulty are reported with lithium, and reports suggest they are more likely at higher blood levels and when lithium is combined with other psychiatric medicines. Lithium also affects thyroid function, and an underactive thyroid produces its own fatigue and low desire — so the cause may sit one step downstream.
What the rating means: Sexual effects turn up in the reporting for this class without being the typical experience. Worth knowing about, not worth expecting.
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.
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.
Timing and reversibility
Can appear at any point, including long after starting, particularly if the blood level or thyroid function has drifted. Lithium requires regular monitoring anyway, which makes this a natural thing to raise at an existing appointment.
Each of these has its own sexual effects, separate from the medicine’s. Working out which half you are dealing with is usually the whole question.
Thyroid conditionsOne of the most testable and most missed causes of low desire and fatigue.
What to ask the person who prescribed it
What was my last lithium level, and my last thyroid result?
Could an underactive thyroid be contributing to how I feel?
Am I on other medicines that could be adding to this?
Things that help without touching the prescription
Note when the change started relative to your last level check — that timeline is genuinely useful to a prescriber.
Care signal
Fatigue, low mood, and low desire together in someone taking lithium can point at thyroid function rather than at the sex-life question itself — worth a blood test rather than a product.
Sometimes reported for this class. Reduced desire and erection difficulty are reported with lithium, and reports suggest they are more likely at higher blood levels and when lithium is combined with other psychiatric medicines. Lithium also affects thyroid function, and an underactive thyroid produces its own fatigue and low desire — so the cause may sit one step downstream.
How soon would lithium cause a change, and does it reverse?
Can appear at any point, including long after starting, particularly if the blood level or thyroid function has drifted. Lithium requires regular monitoring anyway, which makes this a natural thing to raise at an existing appointment.
What should I do if I notice this while taking lithium?
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 lithium at my appointment?
A specific question gets a better answer than a general one. For this class: What was my last lithium level, and my last thyroid result? Could an underactive thyroid be contributing to how I feel? Am I on other medicines that could be adding to this?
When is this worth an appointment rather than a wait-and-see?
Fatigue, low mood, and low desire together in someone taking lithium can point at thyroid function rather than at the sex-life question itself — worth a blood test rather than a product.
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.