Mood Stabilizers ComparedLithium, Lamotrigine, Valproate & More

With mood stabilizers compared side by side, the trade-offs become clearer. If you have bipolar disorder, you’ve probably heard several medication names: lithium, lamotrigine, valproate, and a handful of atypical antipsychotics. Each can help, but they work differently, protect against different parts of the illness, and come with different side effects and monitoring needs. Understanding how mood stabilizers compare can help you have a more informed conversation with your psychiatrist. This guide lays them side by side.

This isn’t a substitute for individualized advice. The right choice depends on your history, other health conditions, and plans such as pregnancy.

How Mood Stabilizers Differ

Mood stabilizers differ in which part of bipolar disorder they treat best, whether mania, depression, or both, how quickly they work, their side effects, and the monitoring they require. Some are better at preventing future episodes; others are better at treating an episode that’s already happening.

Many people take more than one medication, especially when one alone doesn’t fully control both poles. Our guide to psychiatric polypharmacy explains when combinations make sense.

Lithium vs Lamotrigine

The main difference in lithium vs lamotrigine is that lithium is strongest at preventing mania and has the best evidence for reducing suicide risk, while lamotrigine is strongest at preventing depressive episodes and is generally easier to tolerate. A BMJ meta-analysis of 48 trials found lithium was more effective than placebo at reducing suicides, with an odds ratio of 0.13.

A review of lamotrigine in bipolar disorder found it delayed new mood episodes, especially depression, in two 18-month trials, didn’t appear to cause weight gain, and had a serious rash rate of about 0.1% in bipolar studies. Lithium requires regular blood levels and kidney and thyroid checks; lamotrigine requires slow titration instead. Our full guides to lithium and lamotrigine go deeper.

Valproate Side Effects and Pregnancy Risk

Valproate side effects include weight gain, tremor, hair thinning, nausea, and effects on the liver and blood counts, and its most serious concern is pregnancy risk. According to a European Medicines Agency safety communication, children exposed to valproate in the womb have about a 10% risk of congenital malformations and up to a 30% to 40% risk of serious developmental problems.

Because of these risks, European regulators advise that valproate shouldn’t be prescribed to women and girls who could become pregnant unless other treatments are ineffective or not tolerated, and U.S. labeling carries a boxed warning. Valproate is effective for mania, so it remains an option for some people, with careful planning.

Valproate also requires monitoring of liver function and blood counts, especially early in treatment. For men and for women who aren’t able to become pregnant, it remains a useful option for mania, and some people tolerate it well long term. The key is an informed, shared decision.

There's no universal best mood stabilizer. There's the one that fits your illness pattern, your body, and your life.

Atypical Antipsychotics as Mood Stabilizers

Atypical antipsychotics, such as quetiapine, olanzapine, aripiprazole, lurasidone, and others, are often used as mood stabilizers because several treat acute mania or bipolar depression and some help prevent future episodes. Their main downsides are metabolic effects, including weight gain, higher blood sugar, and cholesterol changes, which vary a lot between medications.

Monitoring weight, blood sugar, and lipids is part of safe use. Some atypical antipsychotics are more weight-neutral than others, so the choice can be tailored. Our guide to medication and weight gain discusses weight concerns more broadly.

Adherence matters as much as the medication chosen. Many relapses happen when mood stabilizers are stopped or taken inconsistently, often because of side effects or feeling well. If a medication is hard to live with, telling your psychiatrist opens the door to alternatives rather than going without protection.

Mood Stabilizers and Pregnancy

Mood stabilizers and pregnancy require careful planning, because the risks of untreated bipolar disorder, especially postpartum relapse, must be weighed against the risks of each medication. Valproate carries the highest known risk. Lithium and lamotrigine are sometimes continued with close monitoring and dose adjustments, and decisions are best made before conception when possible.

1. Plan ahead. Talk with your psychiatrist before trying to conceive, if possible.
2. Review each medication. Discuss the pregnancy risks of your current mood stabilizers.
3. Consider alternatives. Switching may be recommended well before pregnancy.
4. Monitor closely. Expect more frequent visits and blood levels during pregnancy.
5. Plan for postpartum. The postpartum period carries high relapse risk and needs a plan.

The postpartum period is a time of especially high risk for relapse in bipolar disorder, so a plan for the weeks after delivery, including sleep protection and early follow-up, is as important as decisions during pregnancy.

Our guides to medication while breastfeeding and women’s mental health across life stages explain how these decisions are made.

Finding the Best Mood Stabilizer for Your Bipolar Disorder

Finding the best mood stabilizer for bipolar disorder means matching the medication to your pattern of illness, whether mania or depression dominates, your past responses, side effect priorities, other health conditions, and life plans. It often takes some adjustment, and combinations are common.

A comprehensive psychiatric evaluation can review your history and options. Never stop a mood stabilizer suddenly, as this can trigger relapse. Our guides to types of bipolar disorder and rapid cycling cover related topics. If you’re having thoughts of suicide, call or text 988 in the US.