Lithium for Bipolar Disorder: How It Works, Dosing, and What to Expect
Author:
Blossom Editorial
Lithium is one of the oldest and most well-studied medications used to treat bipolar disorder. More than 50 years after its FDA approval, it remains a first-line treatment for many people. As a mood stabilizer, lithium can help reduce the extreme mood shifts that occur with bipolar disorder.
If you or someone you care about has been prescribed lithium, you may have questions about how it works, what dose is typically prescribed, and what side effects to expect. Understanding the basics can help you feel more prepared as you start treatment and work with your healthcare provider.
Key Takeaways
Lithium has a long track record. Lithium was FDA-approved for bipolar I disorder in 1970 and is still considered a first-line treatment for many people with bipolar disorder. It may take several weeks of consistent use before you notice its full benefits.
Regular blood tests are an important part of treatment. Lithium works best within a specific blood level range, so your provider will monitor your lithium levels as well as your kidney and thyroid function regularly.
Always talk with your provider before making changes. Stopping lithium suddenly or changing your dose on your own can increase the risk of symptoms returning.
What Is Lithium and How Does It Work?
Before looking at how lithium is used, it helps to understand what kind of medication it is.
Lithium is a naturally occurring element that has been used for decades as a mood stabilizer. Although newer medications are now available, it still remains one of the most effective and widely used treatments for bipolar disorder.
Researchers do not fully understand exactly how lithium works. Current evidence suggests it changes the way nerve cells communicate by affecting several chemical signaling pathways in the brain. Overall, these effects may help stabilize mood and reduce the frequency and intensity of both manic and depressive episodes.
What Lithium Treats in Bipolar Disorder
Lithium is used at different stages in the treatment of bipolar disorder, from calming an active episode to helping prevent future mood episodes.
Acute Mania
Lithium is FDA-approved to treat acute manic episodes, which are periods of unusually elevated moods, high energy, racing thoughts, and impulsive behavior that can occur in bipolar I disorder.
Because lithium may take a few weeks to reach its full effect, providers often prescribe a faster-acting medication alongside it. This usually happens at the beginning of treatment if symptoms are severe.
Maintenance and Relapse Prevention
One of lithium's biggest strengths is long-term maintenance treatment. It helps keep mood stable and reduces the risk of future manic and depressive episodes.
The National Institute of Mental Health notes that bipolar disorder is usually a lifelong condition, so many people continue taking lithium long term to help prevent relapses and maintain stability.
Bipolar Depression
The depressive episodes in bipolar disorder can look different from other types of depression. Lithium may also help treat these episodes but it may be combined with other medications depending on your symptoms and treatment plan.
One reason lithium remains a first-line treatment is its association with a lower risk of suicide in people with mood disorders.A review of bipolar disorder suggests that researchers are still studying exactly how this protective effect works but it is one of lithium’s unique benefits compared with many other mood stabilizing medications.
Lithium Dosing and Blood Level Monitoring
Finding the right lithium dose often requires careful monitoring. Unlike many medications, lithium works best within a specific therapeutic range or blood level where it is considered both safe and effective.
Adults often start at around 300 mg taken 2 to 3 times a day, and the right dose may vary from person to person.
Your provider will adjust your dose based on regular blood tests, usually aiming for lithium blood levels between about 0.6 and 1.2 milliequivalents per liter (mEq/L). Higher levels may be recommended during an acute manic episode, while lower levels are often used for long-term maintenance.
Lithium has what doctors call a narrow therapeutic window. This means the difference between an effective dose and one that is too high can be small. For this reason, blood tests are a normal part of treatment, especially when you first start lithium or change your dose. Your provider will also check your kidney and thyroid function from time to time, since long-term lithium use can affect both.
Staying well hydrated and keeping your salt intake fairly consistent can also help keep your lithium levels stable. This is because dehydration or big changes in sodium intake can affect how much lithium stays in your body.
Side Effects and Safety
Like all medications, lithium can cause side effects. Many are mild and may improve over time as your body adjusts to treatment.
Common side effects include:
Increased thirst and a need to urinate more often
Mild hand tremor or shakiness
Nausea, upset stomach, or loose stools, especially during the first few weeks
Weight changes
Feeling tired or having difficulty concentrating
It is also important to recognize the signs of lithium toxicity, which happens when lithium levels become too high. Symptoms of lithium toxicity may include worsening tremor, vomiting, diarrhea, confusion, slurred speech, or difficulty walking. If you notice these symptoms, contact your provider or seek medical care right away.
Certain medications and situations can increase lithium levels, including:
Dehydration
Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen,
Some blood pressure medications
Certain diuretics (or ‘water pills’)
Always let your provider and pharmacist know about every prescription medication, over-the-counter medication, and supplement you take.
What to Expect When Starting Lithium
Starting lithium can feel like a big step, but knowing what to expect in the first few weeks may make the process feel more manageable.
In the beginning, you can expect more frequent appointments and blood tests as your provider finds the right dose for you. Mild side effects, such as nausea or increased thirst, often ease as your body adjusts to the medication.
It can also help to keep a simple log of your mood, symptoms, and any side effects between appointments. Sharing these useful details with your provider can make it easier to adjust your treatment if needed.
Lithium doesn’t work overnight. While some people notice improvements within the first week or two, the full mood-stabilizing benefits often develop over several weeks. Staying in close contact with your care team during this period can help ensure your treatment is working safely and effectively.
If you are exploring whether lithium or another approach fits your situation, you can connect with a board-certified psychiatric provider through Blossom Health for virtual, in-network care.
The Bottom Line
Lithium has been used to treat bipolar disorder for decades and remains an effective first-line treatment for manic episodes and helps prevent future mood episodes.
While treatment requires regular blood tests and ongoing monitoring, many people use lithium safely and effectively over the long term. If you think lithium may be right for you or have questions about your current treatment, a board-certified psychiatric provider at Blossom Health can help you understand your options and create a treatment plan that fits your needs.
Medical Disclaimer
This article is for educational purposes only and does not constitute medical advice. The information provided should not replace consultation with a qualified healthcare provider. Individual responses to medications can vary significantly, and what applies to one person may not be the same for another.
Always consult with your doctor or pharmacist before making any decisions about medication changes, discontinuation, or interactions with other substances. If you’re experiencing concerning symptoms or side effects, please seek professional help from a healthcare provider.
In case of a medical emergency, contact your local emergency services immediately or call 911. For mental health emergencies, contact the National Suicide Prevention Lifeline at 988.
Sources
Chokhawala KP, Lee S, Saadabadi A. Lithium. [Updated 2024 Jan 14]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK519062/
Jain A, Mitra P. Bipolar Disorder. [Updated 2023 Feb 20]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK558998/
Nath M, Gupta V. Mood Stabilizers. [Updated 2023 Apr 24]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK556141/
Hedya SA, Avula A, Swoboda HD. Lithium Toxicity. [Updated 2023 Jun 26]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK499992/
Sekhon S, Gupta V. Mood Disorder. [Updated 2023 May 8]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK558911/
National Institute of Mental Health. (December, 2024). Bipolar Disorder. nimh.nih.gov/health/topics/bipolar-disorder
National Institute of Mental Health. (December, 2023). Mental Health Medications. nimh.nih.gov/health/topics/mental-health-medications
Cleveland Clinic. (April 20, 2026). Mania (Manic Episodes). my.clevelandclinic.org/health/diseases/21603-mania
