Olanzapine
Generic: olanzapine · Brand: Zyprexa® · Class: 2nd Gen Antipsychotic
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How It Works
Olanzapine is a second-generation (atypical) antipsychotic with broad receptor blocking activity — dopamine, serotonin, histamine, acetylcholine, and norepinephrine receptors. This wide mechanism makes it highly effective for psychosis and mania, but also responsible for its significant side effect burden, particularly weight gain and metabolic effects. It is one of the most effective antipsychotics available, often used when other medications have not worked. Combined with fluoxetine (Symbyax), it is FDA-approved for treatment-resistant depression and bipolar depression.
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What It Treats
SchizophreniaHighly effective for positive and negative symptoms
Bipolar I DisorderFDA-approved for acute mania and maintenance
Treatment-Resistant DepressionCombined with fluoxetine as Symbyax — FDA-approved
Bipolar DepressionFDA-approved as Symbyax (olanzapine + fluoxetine)
Acute AgitationAvailable as IM injection for rapid control of agitation
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Dosing Overview
| Population | Start | Typical Range | Max |
|---|---|---|---|
| Adults Schizophrenia | 5–10 mg | 10–20 mg | 20 mg |
| Adults Bipolar Mania | 10–15 mg | 10–20 mg | 20 mg |
| Adults Depression (Symbyax) | 6/25 mg | 6/25–12/50 mg | 18/75 mg |
| Older Adults Start low | 2.5–5 mg | 5–10 mg | 10 mg |
Taken once daily at bedtime. Can be taken with or without food. Orally disintegrating tablet (Zydis) available for patients who have difficulty swallowing. IM formulation available for acute agitation.
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Side Effects
Common
- Significant weight gain
- Sedation
- Increased appetite
- Dry mouth
- Constipation
- Dizziness
- Elevated blood sugar
- Elevated cholesterol
Call us if you notice
- Tardive dyskinesia (involuntary movements)
- Neuroleptic malignant syndrome (NMS)
- Significant weight gain or metabolic changes
- High blood sugar or new diabetes
- Severe restlessness (akathisia)
- Muscle stiffness or rigidity
- New onset diabetes
- Significant hyperlipidemia
Olanzapine is highly effective but carries the highest risk of weight gain and metabolic effects of any second-generation antipsychotic. Regular monitoring of weight, blood sugar, and cholesterol is essential.
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Tips for Success
Same Time DailyTake at the same time each day for consistent levels in your system.
With FoodTaking with food reduces nausea and stomach upset.
Don't Stop AbruptlyAlways taper with your provider guidance — stopping suddenly can cause rebound symptoms.
Avoid AlcoholAlcohol increases sedation and side effects significantly.
Tell All ProvidersLet other prescribers know what you are taking — interactions matter.
Track Your MoodNote any changes in mood, movement, or weight and share with your provider.
Monitor WeightWeigh yourself weekly. Significant weight gain is common — discuss diet and exercise strategies with your provider early.
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Important Safety Information
Tardive Dyskinesia: Long-term use of antipsychotics can cause involuntary repetitive movements of the face, tongue, or limbs. Report any unusual movements to your provider immediately.
Elderly Patients with Dementia: Antipsychotics carry a black box warning for increased risk of death in elderly patients with dementia-related psychosis. These medications are not approved for this use.
Metabolic Effects: Many antipsychotics can cause weight gain, elevated blood sugar, and increased cholesterol. Your provider will monitor these regularly.
Pregnancy & Breastfeeding: Discuss risks and benefits with your provider. Do not stop without consultation.
Drug Interactions: Antipsychotics interact with many medications including other CNS depressants, blood pressure medications, and QT-prolonging drugs. Always share your full medication list.
Diabetes Risk: Olanzapine significantly increases the risk of new-onset type 2 diabetes. Blood glucose should be monitored regularly. Report increased thirst, urination, or unexplained weight loss.
Questions? I am here.
Reach me between appointments if you have concerns about side effects, notice mood changes, or have questions about your medication.
360-389-3712
info@rootedmindspsychiatry.com