Quetiapine (Seroquel): Uses, Warnings and Key Facts
Quick summary Quetiapine is an atypical antipsychotic medicine used for conditions such as schizophrenia, bipolar disorder, and, in some formulations, as add-on treatment for major depressive episodes. Brand names include Seroquel and Seroquel XR....
This content is for educational purposes only and does not replace medical advice, diagnosis or treatment from a qualified healthcare professional.
Quick summary
Quetiapine is an atypical antipsychotic medicine used for conditions such as schizophrenia, bipolar disorder, and, in some formulations, as add-on treatment for major depressive episodes. Brand names include Seroquel and Seroquel XR.
Medical disclaimer: This article is for general information only. It does not replace the official patient leaflet, prescribing information, or advice from a doctor or pharmacist. Do not use this page to diagnose a condition or to change any treatment on your own.
What is quetiapine?
Quetiapine is the active ingredient in medicines such as Seroquel and Seroquel XR. It is an atypical antipsychotic used in several psychiatric conditions.
The original content identifies quetiapine fumarate as the ingredient form.
How quetiapine works
Quetiapine interacts with several neurotransmitter receptors in the brain, including serotonin and dopamine receptors. It also has activity at adrenergic and histaminergic receptors. This broad receptor profile helps explain both its therapeutic effects and some of its common side effects.
What quetiapine is used for
Based on the original content, quetiapine is used for:
- Schizophrenia in adults
- Manic episodes in bipolar disorder in adults
- Depressive episodes in bipolar disorder in adults
- Prevention of recurrence in bipolar disorder in adults
- Additional treatment of major depressive episodes in major depressive disorder when response to antidepressant monotherapy has not been optimal, for prolonged-release tablets
How it is taken
The original content describes both immediate-release and prolonged-release tablets.
- Immediate-release tablets: may be taken with or without food.
- Prolonged-release tablets: should be swallowed whole and not broken, chewed, or crushed. They are taken without food.
Exact dosing depends on the condition, the formulation, age, and individual response. The official leaflet or prescribing information should always be checked for the correct schedule.
Typical dose ranges mentioned in the original content
The content provided includes dose ranges for several indications. Because dosing must be individualized, the table below is a summary only and should not be used as a self-treatment guide.
| Indication | Summary from original content |
|---|---|
| Schizophrenia | Dose is titrated over the first days, then adjusted according to response and tolerability. |
| Manic episode in bipolar disorder | Dose is increased gradually over the first days, then adjusted within a wider maintenance range. |
| Depressive episode in bipolar disorder | Usually taken once daily at bedtime, with gradual titration. |
| Prevention of recurrence in bipolar disorder | Dose is adjusted based on response and tolerability. |
| Add-on treatment for major depressive episodes | Prolonged-release tablets are taken once daily at bedtime, with gradual titration. |
Who needs extra caution
The original content highlights extra caution in older adults and in people with certain medical conditions, including:
- Liver disease
- Diabetes or risk factors for diabetes
- Known cardiovascular or cerebrovascular disease
- Conditions that may predispose to low blood pressure
- History of seizures
- History of alcohol or drug abuse
- Family history of prolonged QT
- Risk of aspiration pneumonia
The content also notes caution in people with Parkinson’s disease, sleep apnea risk, urinary retention, enlarged prostate, intestinal obstruction, elevated eye pressure, or narrow-angle glaucoma.
Contraindications and important interactions
The original content lists hypersensitivity to quetiapine as a contraindication. It also states that quetiapine should not be used with certain CYP3A4 inhibitors, including some HIV protease inhibitors, azole antifungals, erythromycin, clarithromycin, and nefazodone.
Other interaction points mentioned include:
- Alcohol and other central nervous system depressants
- Other medicines with anticholinergic effects
- Medicines that may affect the QT interval or electrolytes
- Carbamazepine, phenytoin, and thioridazine
- Grapefruit juice
Pregnancy and breastfeeding
The original content says quetiapine should be used in pregnancy only when the expected benefit justifies the potential risk.
For breastfeeding, the provided text does not give a clear clinical recommendation. If quetiapine is being considered during breastfeeding, the official leaflet and a clinician’s advice should be checked.
Driving and operating machinery
Quetiapine can cause drowsiness, dizziness, visual changes, and slower reaction time. Until an individual knows how the medicine affects them, extra caution is advised with driving or using machinery.
Possible side effects mentioned in the original content
The original content lists a wide range of adverse reactions, including:
- Drowsiness, dizziness, headache, syncope, and blurred vision
- Orthostatic hypotension
- Dry mouth, constipation, dyspepsia, and vomiting
- Weight gain, increased appetite, and changes in blood glucose and lipids
- Changes in blood counts
- Elevated liver enzymes
- Withdrawal symptoms
- Peripheral edema and fatigue
The content also mentions serious reactions such as tardive dyskinesia, neuroleptic malignant syndrome, neutropenia, venous thromboembolism, pancreatitis, suicidal thinking, cardiomyopathy, myocarditis, and severe skin reactions. These require urgent medical attention if suspected.
Overdose note
The original content states that overdose with prolonged-release quetiapine may have delayed sedation and pulse effects, with prolonged recovery. It also mentions that gastric bezoar formation has been reported in some extended-release overdoses.
Safety reminder
If you have been prescribed quetiapine, use the exact formulation and schedule given by your clinician and check the official leaflet for your specific product. Seek urgent medical help for severe sleepiness, breathing problems, fainting, chest symptoms, severe rash, or signs of an allergic reaction.
Frequently asked questions
▸ What is quetiapine mainly used for?
The original content lists schizophrenia, bipolar disorder, and add-on treatment for some major depressive episodes as the main uses.
▸ Is quetiapine the same as Seroquel?
Quetiapine is the active ingredient. Seroquel and Seroquel XR are brand names mentioned in the source content.
▸ Can quetiapine be taken with food?
The original content says immediate-release tablets may be taken with or without food, while prolonged-release tablets should be taken without food and swallowed whole.
▸ What side effects are most important to watch for?
The source lists drowsiness, dizziness, low blood pressure on standing, weight gain, changes in blood sugar or lipids, and several serious reactions that need medical attention.
▸ Does quetiapine interact with other medicines?
Yes. The original content highlights interactions with CYP3A4 inhibitors, alcohol, grapefruit juice, other central nervous system depressants, anticholinergic medicines, and drugs that affect the QT interval.
▸ Where can I verify the official information?
Check the FDA medication guide and the product’s official prescribing information or patient leaflet for the exact formulation you have.
Sources and official references
The original content was based on FDA and USP-related ingredient information. For verification, consult official drug references and the patient leaflet for the exact product.
- FDA Medication Guides
- UNII: BGL0JSY5SI
- ChemIDplus
- DrugPortal
- PubChem CID: 5002
- NCI Thesaurus: C61917
Medical disclaimer
This content is for educational purposes only. It should not be used as a substitute for professional medical advice, diagnosis or treatment. Always ask a doctor, pharmacist or qualified healthcare professional before starting, stopping or changing any medicine.
Sources and verification
The following sources or official references are listed to support verification of the medicine information discussed in this article.
Medicine information can change and may vary depending on country, product formulation, patient history and professional guidance. Always check official medicine information and ask a healthcare professional for personal medical questions.