Quick Answer
Starting lithium involves baseline tests of kidney function, electrolytes and thyroid function, plus a pregnancy check when relevant, followed by gradual dosing guided by blood levels. The FDA label lists target levels of 0.8 to 1.2 mEq/L for acute mania and 0.8 to 1.0 mEq/L for maintenance. Toxicity can occur near therapeutic levels, so monitoring matters.
Understanding starting Lithium
Lithium has been used for bipolar disorder for decades and remains a cornerstone of treatment for many people. It helps prevent both manic and depressive episodes. Because the effective dose is close to the dose that can cause toxicity, starting lithium involves careful planning. According to its FDA prescribing information, kidney function, vital signs, electrolytes and thyroid function should be evaluated before treatment begins, along with a review of other medications and pregnancy status. These baseline tests help choose a safe starting dose and provide a comparison for later monitoring. This guide is part of the NY bipolar depression resource center.
Lithium is dosed using blood levels. The label lists a target of 0.8 to 1.2 mEq/L for acute manic or mixed episodes and 0.8 to 1.0 mEq/L for maintenance. Levels are usually drawn about 12 hours after the last dose, often in the morning before the next dose, so results are comparable. In the first weeks, levels are checked more often while the dose is adjusted. Once stable, checks become less frequent. Our guide on thyroid monitoring on lithium covers one important part of long-term care.
For New Yorkers facing humid summers and long walks in the heat, lithium hydration advice is more than a footnote. NIMH reports that among adults with past-year bipolar disorder, the remaining 17.1% had moderate impairment, meaning nearly everyone affected faces real disruption. Secure video visits from anywhere in New York can make it easier to start bipolar care and keep regular follow-ups without extra travel.
Baseline tests before lithium, blood levels and dose changes, and avoiding lithium toxicity are the three topics this guide covers.
Common side effects
Early side effects can include thirst, frequent urination, mild tremor, nausea and loose stools. Many ease as the body adjusts or with dose timing changes, like taking lithium with food or at night. Over time, some people notice weight gain, acne or changes in thyroid or kidney function, which is why ongoing monitoring matters. Tell your prescriber about any side effects, since adjustments are often possible.
Pregnancy and lithium
Lithium can be used during pregnancy in some situations, but it requires careful planning. The label notes that kidney clearance of lithium increases during pregnancy and drops quickly at delivery, so levels need close monitoring and dose adjustments. If you could become pregnant, discuss plans with your prescriber before starting or stopping lithium. Stopping suddenly can trigger relapse.
Starting Lithium at a glance
| Step | What it involves |
|---|---|
| Before starting | Kidney function, vital signs, electrolytes, thyroid, pregnancy status |
| Acute mania target | 0.8 to 1.2 mEq/L |
| Maintenance target | 0.8 to 1.0 mEq/L |
| Ongoing | Regular levels, kidney and thyroid checks |
| Higher-risk situations | Dehydration, illness, interacting medications |
Lithium toxicity
The FDA label carries a boxed warning that lithium toxicity is closely related to serum levels and can occur at doses close to therapeutic concentrations. Early signs include worsening tremor, diarrhea, vomiting, unusual drowsiness, muscle weakness, unsteadiness and confusion. If these appear, contact your prescriber promptly or seek urgent care, since a level may need to be checked right away. Severe toxicity is a medical emergency. Knowing the signs helps you act early.
What raises lithium levels
Several things can raise lithium levels: dehydration from heat, exercise, vomiting or diarrhea, low-salt diets, kidney problems and certain medications. The label notes that drugs affecting kidney function and some that raise lithium concentrations increase toxicity risk. Common examples include some blood pressure medications, diuretics and anti-inflammatory pain relievers like ibuprofen. Always tell your prescriber and pharmacist that you take lithium before starting a new medication, and stay well hydrated, especially in summer. Our guides on thyroid monitoring on lithium and bipolar depression with kidney disease cover related topics.
Lithium monitoring for New York patients
Lithium follow-ups happen by secure video, with blood levels drawn at a lab near you. Visits run by secure video anywhere in New York, while you’re physically in the state. The practice is in-network with Aetna and Cigna; confirm your New York plan with the office, and see self-pay fees on the Good Faith Estimate page.
Long-term monitoring
Once stable, lithium levels, kidney function and thyroid function are typically checked every few months, or more often for people with risk factors. Older adults and people with kidney concerns may need lower doses and closer follow-up. Keeping a record of your levels and lab results helps you and your clinician track trends over the years.
When to seek help
Seek urgent care for signs of lithium toxicity, like severe tremor, vomiting, diarrhea, confusion or unsteadiness. Contact your prescriber before starting new medications or if you become dehydrated. Thoughts of suicide need immediate help through 988, and call 911 in an emergency. With careful monitoring, many people take lithium safely for years.
Key Takeaways
- Lithium needs baseline kidney, electrolyte and thyroid tests.
- Doses are adjusted using blood levels, not just symptoms.
- Toxicity can occur at levels close to the therapeutic range.
- Dehydration, some pain relievers and blood pressure drugs can raise levels.
The Bottom Line
Starting Lithium is common and treatable, and careful care can make daily life feel more manageable.
Frequently Asked Questions
What tests are needed before starting lithium?
Before starting lithium, its FDA label calls for evaluating kidney function, vital signs, electrolytes and thyroid function. Other medications and pregnancy status are reviewed too. These tests help choose a safe starting dose. They also provide a comparison for later monitoring. Your clinician orders them before the first prescription.
What is a normal lithium level?
The FDA label lists a target of 0.8 to 1.2 mEq/L for acute manic or mixed episodes. For maintenance, the target is 0.8 to 1.0 mEq/L. Levels are usually drawn about 12 hours after the last dose. Your clinician interprets results alongside symptoms and side effects. Targets may vary for some people, like older adults.
Which symptoms suggest my lithium level is too high?
Early signs include worsening tremor, diarrhea, vomiting, unusual drowsiness, muscle weakness, unsteadiness and confusion. The FDA label warns toxicity can occur near therapeutic levels. Contact your prescriber promptly or seek urgent care if these appear. A level may need to be checked right away. Severe toxicity is a medical emergency.
Which medications can raise lithium levels?
Some blood pressure medications, diuretics and anti-inflammatory pain relievers like ibuprofen can raise lithium levels. Drugs affecting kidney function increase toxicity risk. Dehydration and low-salt diets can also raise levels. Tell your prescriber and pharmacist that you take lithium before starting anything new. Stay well hydrated, especially in summer.
What should I know about lithium if I might become pregnant?
Lithium can be used during pregnancy in some situations, with careful planning. Kidney clearance of lithium changes during pregnancy and at delivery. Levels need close monitoring and dose adjustments. Discuss plans with your prescriber before starting or stopping. Stopping suddenly can trigger relapse. An evaluation can clarify what's happening and which options fit.
Can lithium be monitored through telehealth in New York?
Yes, lithium follow-ups happen by secure video anywhere in New York, with blood levels drawn at a lab near you. You need to be physically in New York during each visit. Results are reviewed together. The practice is in-network with Aetna and Cigna; confirm your New York plan with the office. Prescriptions go electronically to your pharmacy.
Where to go from here
- Right now, if you're not safe
- Call or text 988, or call 911.
- If you'd like an evaluation
- See how scheduling and telehealth work on the new patient page.
- If you want to keep reading
- Return to our bipolar care hub for New York adults for more guides. For more help preparing and finding care, see NIMH’s tips for talking with your health care provider.
How We Reviewed This Page
Written by Steven Lockhart of Health Marketing Group and clinically reviewed by Gabriella I. Farkas, MD PhD, a board-certified psychiatrist. Clinical information comes from the sources listed below, and the page is reviewed every 180 days or when guidance changes.
What’s new: September 29, 2026. Page published.
References
- FDA. Lithium and Lithium Carbonate Prescribing Information (2018). https://www.accessdata.fda.gov/drugsatfda_docs/label/2018/017812s033,018421s032,018558s027lbl.pdf
- National Institute of Mental Health. Bipolar Disorder statistics. https://www.nimh.nih.gov/health/statistics/bipolar-disorder
- 988 Suicide & Crisis Lifeline. https://988lifeline.org/
- Tips for talking with your health care provider. https://www.nimh.nih.gov/health/publications/tips-for-talking-with-your-health-care-provider