Quetiapine
Generic: quetiapine fumarate · Brand: Seroquel® / Seroquel XR® · Class: 2nd Gen Antipsychotic
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How It Works
Quetiapine is a second-generation (atypical) antipsychotic that works by blocking dopamine D2 and serotonin 5-HT2A receptors. It also strongly blocks histamine receptors, causing significant sedation — which makes it useful for sleep at low doses. At low doses (25–100 mg) quetiapine is primarily used off-label for insomnia and anxiety. At higher doses (300–800 mg) it functions as a full antipsychotic and mood stabilizer. Seroquel XR (extended release) is taken once daily and may cause less daytime sedation.
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What It Treats
SchizophreniaFDA-approved for adults
Bipolar I DisorderFDA-approved for manic, depressive, and mixed episodes
Bipolar DepressionOne of few medications FDA-approved specifically for bipolar depression
Major Depression AugmentationFDA-approved as add-on when antidepressants are not enough
Insomnia / AnxietyWidely used off-label at low doses for sleep and anxiety
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Dosing Overview
| Population | Start | Typical Range | Max |
|---|---|---|---|
| Adults Schizophrenia | 25 mg twice daily | 300–800 mg | 800 mg |
| Adults Bipolar Mania | 50 mg twice daily | 400–800 mg | 800 mg |
| Adults Bipolar Depression | 50 mg at bedtime | 300 mg | 600 mg |
| Adults Insomnia (off-label) | 25 mg at bedtime | 25–100 mg | 100 mg |
Immediate release taken 2–3 times daily; XR taken once daily at bedtime. Always take with food. Titrate slowly to minimize sedation and dizziness.
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Side Effects
Common
- Sedation and drowsiness
- Weight gain
- Dry mouth
- Dizziness
- Constipation
- Increased appetite
- Low blood pressure when standing
- Blurred vision
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
- Cataracts (long-term use)
- Elevated triglycerides
Sedation is the most common complaint — this can be helpful for sleep but problematic during the day. Weight gain and metabolic effects are significant concerns with long-term use and require regular monitoring.
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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.
Eye ExamsLong-term quetiapine use is associated with cataract formation. Annual eye exams are recommended.
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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.
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