fluoxetine vs olanzapine
Side-by-side comparison of fluoxetine and olanzapine. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
major Known Drug Interaction
NSAIDs, Aspirin, Warfarin): May potentiate the risk of bleeding ( 7.4 ) Drugs Tightly Bound to Plasma Proteins: May cause a shift in plasma concentrations ( 7.6 , 7.7 ) Olanzapine: When used in combination with fluoxetine, also refer to the Drug Interactions section of the package insert for Symbyax ( 7.7 ) Drugs that Prolong the QT Interval: Do not use fluoxetine with thioridazine or pimozide. Olanzapine — Fluoxetine (60 mg single dose or 60 mg daily dose for 8 days) causes a small (mean 16%) increase in the maximum concentration of olanzapine and a small (mean 16%) decrease in olanzapine...
Recommendation: Your doctor may need to adjust your doses or monitor you more closely when these drugs are used together.
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Fluoxetine is a medicine that can help treat depression and other mental health conditions. It belongs to a class of drugs called selective serotonin reuptake inhibitors (SSRIs).
Olanzapine is a medicine used to treat certain mental disorders. It helps to balance chemicals in the brain to improve mood and behavior.
Fluoxetine can treat major depressive disorder in adults and children. It also treats obsessive-compulsive disorder (OCD) in adults and children. Fluoxetine can help with bulimia nervosa (an eating disorder) and panic disorder. Sometimes, it is used with another medicine called olanzapine to treat depression related to bipolar disorder.
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.
Fluoxetine works by increasing the amount of serotonin in your brain. Serotonin is a chemical that helps regulate mood. By increasing serotonin, fluoxetine can help improve mood and reduce symptoms of depression, OCD, and other conditions.
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.
- • Abnormal dreams
- • Problems ejaculating
- • Loss of appetite
- • Feeling anxious
- • Feeling weak
- • Dizziness
- • Weight gain
- • Increased appetite
- • Dry mouth
- • Constipation
- The medicine is interacting with another medicine 3,336
- Harmful effect from different substances 3,316
- Feeling sick to your stomach 3,233
- Feeling tired 3,155
- Death by suicide 2,904
- Weight gain 6,721
- Diabetes 5,388
- The medicine is interacting with another medicine 4,050
- Poisoning from different substances 3,965
- Sleepiness 3,838
Antidepressants may increase the risk of suicidal thoughts and behaviors in children, teenagers, and young adults. Watch closely for worsening depression or suicidal thoughts. Tell your doctor right away if you notice any changes in mood or behavior. Fluoxetine is not approved for use in children younger than 7 years old.
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.
Talk to your doctor if you are pregnant or plan to become pregnant. Fluoxetine should only be used during pregnancy if the benefit outweighs the risk to the baby. Breastfeeding is not recommended while taking fluoxetine.
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.
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How to Read This fluoxetine vs olanzapine Comparison
fluoxetine is classified in the Selective Serotonin Reuptake Inhibitor (SSRI) 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, fluoxetine has 15,944 submissions while olanzapine has 23,962. 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 major interaction flagged in FDA labeling, attributed to fluoxetine can cause a small change in the amount of olanzapine that stays in your blood. this happens because fluoxetine interferes with how your body breaks down the other medication.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between fluoxetine and olanzapine - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.