Olanzapine / Samidorphan
Generic: olanzapine / samidorphan · Brand: Lybalvi® · Class: 2nd Gen Antipsychotic + Opioid Receptor Antagonist
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How It Works
Lybalvi is a combination tablet containing olanzapine and samidorphan. Olanzapine is a well-established, highly effective antipsychotic — but it is known for causing significant weight gain. Samidorphan is an opioid receptor antagonist added specifically to reduce the weight gain associated with olanzapine. Clinical trials showed Lybalvi caused significantly less weight gain than olanzapine alone while maintaining the same antipsychotic efficacy. It is a good option for patients who have responded well to olanzapine but are concerned about weight or have experienced significant weight gain on it.
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What It Treats
SchizophreniaFDA-approved for adults — same efficacy as olanzapine with reduced weight gain
Bipolar I DisorderFDA-approved for acute manic and mixed episodes and maintenance
Patients on Olanzapine with Weight ConcernsDesigned specifically for patients where olanzapine is effective but weight gain is problematic
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Dosing Overview
| Population | Start | Typical Range | Max |
|---|---|---|---|
| Adults Schizophrenia | 5/10 mg | 10/10 mg | 20/10 mg |
| Adults Bipolar Mania | 10/10 mg | 10–20/10 mg | 20/10 mg |
| Older Adults Start low | 2.5/10 mg | 5–10/10 mg | 10/10 mg |
Taken once daily with or without food. The samidorphan component is always 10 mg regardless of olanzapine dose. Cannot be used in patients currently using opioids or those in opioid withdrawal.
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Side Effects
Common
- Weight gain (less than olanzapine alone)
- Sedation
- Dry mouth
- Constipation
- Dizziness
- Increased appetite
- Elevated blood sugar
- Elevated cholesterol
Call us if you notice
- Tardive dyskinesia (involuntary movements)
- Neuroleptic malignant syndrome (NMS)
- Significant weight gain
- High blood sugar or new diabetes
- Severe restlessness (akathisia)
- Muscle stiffness or rigidity
- Opioid withdrawal if opioids are used concurrently
Lybalvi provides the proven effectiveness of olanzapine with meaningfully less weight gain. However, weight gain can still occur — it is reduced, not eliminated. Metabolic monitoring is still important.
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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.
No OpioidsSamidorphan blocks opioid receptors — using opioids while taking Lybalvi will reduce their effectiveness and can cause withdrawal symptoms.
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Important Safety Information
Tardive Dyskinesia: Long-term use 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. 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. Always share your full medication list.
Opioid Contraindication: Lybalvi contains samidorphan, an opioid antagonist. It is contraindicated in patients using opioids (including opioid pain medications) and in patients undergoing opioid withdrawal. Using opioids with Lybalvi may precipitate withdrawal and will reduce opioid effectiveness.
Diabetes Risk: Like olanzapine, Lybalvi can elevate blood sugar and increase diabetes risk. Monitor blood glucose regularly.
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