lithium vs olanzapine
According to this portal's Publishing Organization, this page was last reviewed in August 2026 against our methodology. Figures and extracts on this site, including tables above 1,000 rows when the corpus is that large, are the publisher's responsibility.
Side-by-side comparison of lithium and olanzapine. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
( 7.2 ) Other Concomitant Drug Therapy: When using olanzapine in combination with lithium or valproate, refer to the Drug Interactions sections of the package insert for those products. Lithium — Multiple doses of olanzapine (10 mg for 8 days) did not influence the kinetics of lithium. Therefore, concomitant olanzapine administration does not require dosage adjustment of lithium [see Warnings and Precautions ( 5.16 )] .
Lithobid, Eskalith
Zyprexa
Lithium is a mood stabilizer medicine. It helps to balance mood swings.
Olanzapine is a medicine used to treat certain mental disorders. It helps to balance chemicals in the brain to improve mood and behavior.
Lithium is used to treat bipolar disorder. Bipolar disorder causes unusual shifts in mood, energy, activity levels, and concentration. Lithium helps to control the extreme highs (mania) and lows (depression) of this condition.
Olanzapine is used to treat schizophrenia in adults and teens (13-17). It also treats manic or mixed episodes of bipolar I disorder in adults and teens (13-17). In adults, it can be used with other medicines to treat bipolar depression.
Lithium affects the flow of sodium in nerve and muscle cells in the body. This helps to stabilize your mood. It may also affect other chemical messenger systems in the brain.
Olanzapine is an atypical antipsychotic. It works by affecting the levels of certain chemicals in your brain. These chemicals include dopamine and serotonin, which can help improve mood, thinking, and behavior.
- • Tremor (shaking)
- • Nausea
- • Increased weight
- • Fatigue (feeling tired)
- • Vomiting
- • Dizziness
- • Weight gain
- • Increased appetite
- • Dry mouth
- • Constipation
- Toxicity To Various Agents 2,179
- Drug Interaction 1,526
- Tremor 1,462
- Nausea 1,344
- Weight Increased 1,153
- Weight Increased 6,722
- Diabetes Mellitus 5,388
- Drug Interaction 4,048
- Toxicity To Various Agents 3,966
- Somnolence 3,839
Lithium levels in your blood need to be monitored closely by your doctor. Too much lithium can be toxic and cause serious side effects. Make sure to attend all scheduled blood tests.
Olanzapine can increase the risk of death in older adults with dementia-related psychosis. Olanzapine is not approved to treat this condition. When using olanzapine with fluoxetine, read the Symbyax label for more warnings.
Lithium can harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. Lithium can pass into breast milk and may harm a nursing infant. Talk to your doctor about the best way to feed your baby if you are taking lithium.
If you take olanzapine during the third trimester of pregnancy, your baby may have withdrawal symptoms after birth. There is a pregnancy registry to monitor outcomes in women who take atypical antipsychotics during pregnancy. Talk to your doctor.
Also Compare, Nearby Drugs
Compare olanzapine with
How to Read This lithium vs olanzapine Comparison
lithium is classified in the Mood Stabilizer drug class, while olanzapine sits within the Atypical Antipsychotic class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, lithium has 7,664 submissions while olanzapine has 23,963. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to olanzapine does not change how the body processes lithium. these two drugs do not seem to interfere with each other's levels in the blood.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot represent individual circumstances. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This registry does not provide medical, treatment, substitution, or medication-change directions for lithium or olanzapine.
Registry boundary: This comparison displays source-record fields and does not provide individualized medical direction.