Yes, mood stabilizers can affect libido, and many people taking them notice changes in sexual desire or function. The extent depends heavily on which medication you’re taking. Up to 50% of people on lithium report some form of sexual difficulty, while anticonvulsant mood stabilizers tend to have a lighter impact. The picture gets more complicated because bipolar disorder itself changes sexual drive during mood episodes, making it hard to know what’s caused by the illness and what’s caused by the treatment.
How Common Sexual Side Effects Are
Sexual difficulties are one of the most frequently reported side effects of mood-stabilizing medications, yet they’re often underdiagnosed because patients and providers don’t always bring them up. Among people on long-term lithium treatment, studies have found that roughly 37% meet clinical thresholds for sexual dysfunction. About 30% of people with bipolar disorder directly attribute their sexual problems to starting lithium. These numbers climb when lithium is combined with other medications: adding a benzodiazepine (a common anti-anxiety drug) nearly triples the rate of sexual difficulties, from about 14% to 49%.
Anticonvulsant mood stabilizers like valproate and lamotrigine perform better by comparison. In head-to-head research, people taking anticonvulsants alone had better scores across every dimension of sexual function, including desire, arousal, and orgasm, than those on lithium alone or lithium combined with other drugs.
Lithium’s Effect on Sexual Desire
Lithium is the oldest and most studied mood stabilizer, and its relationship to libido is surprisingly murky. Early research raised alarms about high rates of sexual dysfunction, but more careful studies suggest that lithium on its own may not be the major culprit. One study from the American Journal of Psychiatry found no relationship between lithium blood levels and sexual dysfunction scores, and concluded that lithium alone is unlikely to have a major effect on sexual function during long-term treatment.
The biological mechanism remains unclear. Three possible pathways have been proposed: sedation reducing interest in sex, interference with the nervous system signals involved in arousal, and hormonal changes like elevated prolactin or reduced testosterone. But none of these has been definitively linked to lithium specifically. What does seem clear is that combining lithium with other psychiatric medications, particularly benzodiazepines, significantly worsens sexual outcomes. If you’re on lithium and experiencing low desire, the combination of drugs you take may matter more than the lithium itself.
Anticonvulsants and Hormones
Valproate and lamotrigine are widely used as mood stabilizers, and both affect reproductive hormones in measurable ways. In men, both drugs are associated with testosterone levels roughly half those of untreated individuals. One study found average testosterone levels of 3.3 ng/ml in men on valproate or lamotrigine, compared to 6.6 ng/ml in controls. Since testosterone is a primary driver of sexual desire in both men and women, this drop can translate directly into lower libido.
Valproate carries additional concerns for male reproductive health. Research links it to reduced sperm motility, higher rates of abnormally shaped sperm, and smaller testicular size. These effects appear to stem from a direct impact on testicular function rather than a brain-level hormonal signal, though the exact mechanism is still unknown. Lamotrigine, while it also lowers testosterone, tends to preserve testicular function somewhat better based on hormonal ratios, and is generally considered one of the mood stabilizers with the fewest sexual side effects overall.
Atypical Antipsychotics Used as Mood Stabilizers
Several atypical antipsychotics, including quetiapine, olanzapine, and aripiprazole, are prescribed as mood stabilizers for bipolar disorder. Their impact on libido varies dramatically depending on how strongly they raise prolactin, a hormone that suppresses sexual desire when elevated.
Risperidone is the worst offender. In a large study following patients for over a year, 67.8% of people on risperidone experienced sexual dysfunction. Reduced libido was the single most common complaint, reported by 60% of patients. Among men specifically, 37.8% reported decreased desire and 32.1% reported erectile difficulties. Among women, 40.5% reported lower desire and 19% reported problems with arousal. The rate of sexual dysfunction on risperidone is roughly double that of olanzapine.
Quetiapine, olanzapine, aripiprazole, and clozapine are classified as “prolactin-sparing,” meaning they raise prolactin levels far less. This gives them a meaningful advantage for sexual function. However, quetiapine still affects men more than women in practice. One study found that men on quetiapine reported significantly worse sexual function scores than women on the same drug. Among women with bipolar disorder, lithium alone actually produced better sexual function scores than quetiapine or olanzapine.
Bipolar Disorder Itself Changes Libido
Separating the medication’s effects from the illness itself is one of the trickiest parts of this question. Bipolar disorder profoundly alters sexual drive during mood episodes, and those shifts don’t always resolve between episodes.
During manic or hypomanic phases, sexual drive often surges. People describe it not just as increased desire but as an internal pressure or urge. They may want more experimental sex, become easily bored with their usual patterns, and pursue more sexual interactions overall. During depressive episodes, the pattern reverses: desire typically drops sharply. Women in one qualitative study described simply not being oriented toward sex at all during depression. Men showed a more complex pattern. Rather than just losing interest, some described a “negative sex drive,” with self-destructive sexual behavior or feelings of frustration and sadness tied to intimacy.
These swings affect partners too. The contrast between hypersexuality during mania and absent desire during depression often persists into stable periods and can strain relationships long after an acute episode ends. When you start a mood stabilizer and notice lower libido, it’s worth considering whether your previous “baseline” was actually elevated desire from a hypomanic state that felt normal to you.
Gender Differences in Sexual Side Effects
Men and women don’t experience mood stabilizer side effects identically. Across studies, men on mood stabilizers tend to report more overall sexual difficulty than women when measured by standardized questionnaires. This difference is especially pronounced with quetiapine: men on quetiapine or quetiapine combined with lithium scored significantly worse than women on the same regimens.
Women appear to tolerate lithium better sexually than the alternatives. Female patients on lithium monotherapy had better sexual function scores than those on quetiapine or olanzapine. This pattern didn’t hold for men, whose scores were similar regardless of which mood stabilizer they took. The reasons likely involve differences in hormonal pathways, since prolactin elevation and testosterone suppression affect male and female physiology differently, but the practical takeaway is that the “best” mood stabilizer for preserving libido may depend partly on your sex.
Options When Libido Is Affected
If you’re noticing sexual changes on a mood stabilizer, several strategies exist. The most commonly discussed approaches include dose reduction, switching to a medication with a better sexual side effect profile, waiting for the side effects to resolve on their own, and brief “drug holidays” where you stop medication for two to three days before planned sexual activity.
Switching medications is often the most effective option. Moving from a prolactin-raising antipsychotic like risperidone to a prolactin-sparing one can make a significant difference. Among traditional mood stabilizers, anticonvulsants in monotherapy consistently show the least negative effects on sexual function compared to lithium-based regimens. Lamotrigine in particular is frequently cited as a mood stabilizer with a relatively favorable sexual side effect profile.
Dose reduction sounds intuitive, but clinical guidelines actually caution against it. Lowering the dose of a mood stabilizer to improve sexual function risks destabilizing your mood, which can be far more disruptive to your life and relationships than the sexual side effects themselves. Any changes to your regimen should be a conversation with your prescriber, weighing the specific tradeoffs for your situation, your medication, and your mood stability.