Seroquel
In brief
- Quetiapine (Seroquel) is a prescriptionâonly medicine (POM) in the UK, and its use should be supervised by a healthcare professional.
- Seroquel (quetiapine) is an atypical antipsychotic used for schizophrenia, bipolar disorder (mania and depression) and as an adjunct in major depressive disorder; it works mainly by antagonising dopamine D2 and serotonin 5âHT2A receptors, with additional antihistaminic and alphaâadrenergic effects that contribute to sedation.
- Usual dosage: schizophrenia in adults often starts at 25 mg twice daily, titrating to a target of 300â400 mg/day in divided doses (maximum 800 mg); acute bipolar mania often starts 50 mg twice daily, increasing to about 400 mg by day 4 (max 800 mg); bipolar depression typically starts 50 mg at bedtime, titrating to 300 mg (max 300 mg); adjunctive use in MDD commonly uses 50 mg XR at bedtime up to 150â300 mg XR (max 300 mg). Lower starting doses and slower titration are recommended for the elderly and those with liver impairment.
- Form of administration: oral tablets only â immediateârelease tablets (25â400 mg strengths) and extendedârelease (XR) tablets (50â400 mg); do not crush or chew XR tablets and keep in original packaging.
- Onset time: sedative effects and drowsiness can occur within 1â2 hours of dosing; meaningful antipsychotic or mood improvements typically develop over several days to weeks, with some patients noticing changes within 1â2 weeks.
- Duration of action: immediateârelease formulations have an effective duration of roughly 6â12 hours (requiring divided dosing), while XR formulations are designed to provide onceâdaily coverage (~24 hours); sustained clinical benefit requires regular daily dosing.
- Alcohol warning: avoid alcohol while taking seroquel â alcohol increases drowsiness, respiratory depression and the risk of orthostatic hypotension and other adverse effects.
- The most common side effect is drowsiness/sedation; other frequent effects include dry mouth, weight gain and increased appetite, dizziness, constipation, orthostatic hypotension and mild elevations in lipids or liver enzymes.
- Would you like to try Seroquel without a prescription?
Basic Seroquel information
- INN (international nonproprietary name): Quetiapine
- Brand names available in the United Kingdom: Seroquel (immediateârelease tablets 25mg, 50mg, 100mg, 150mg, 200mg, 300mg, 400mg) and Seroquel XL (prolongedârelease tablets 50mg, 150mg, 200mg, 300mg, 400mg)
- ATC code: N05AH04 â Atypical (secondâgeneration) antipsychotic
- Forms & Dosages: Immediateârelease tablets: 25mg, 50mg, 100mg, 150mg, 200mg, 300mg, 400mg. Extendedârelease (XR) tablets: 50mg, 150mg, 200mg, 300mg, 400mg.
- Manufacturers in the United Kingdom: AstraZeneca (originator) and multiple generic manufacturers supplying the UK market, including Teva, Sandoz, Torrent, Sun Pharma, Aurobindo, Mylan, Dr. Reddyâs and Accord Healthcare.
- Registration status in the United Kingdom: Prescription-only medicine; branded Seroquel and Seroquel XL are available alongside generics.
- OTC / Rx classification: Prescription-only (Rx).
- Storage and handling: Store at 15â30°C; extendedârelease tablets must not be crushed or chewed and should be kept in original packaging.
- Standard dosages per condition: Schizophrenia adults â start 25mg twice daily, target 300â400mg/day (max 800mg). Bipolar mania â start 50mg twice daily, increase to ~400mg by Day 4 (max 800mg). Bipolar depression â start 50mg once daily, titrate to 300mg at bedtime (max 300mg). Adjunct in major depressive disorder â XR 50mg at bedtime, up to 150â300mg XR (max 300mg).
- Missed dose / overdose advice: If a dose is missed take when remembered unless close to next dose; do not double up. Overdose may cause drowsiness, tachycardia, hypotension or coma and requires emergency care.
Legal status and availability in the UK
In our online pharmacy, Seroquel is available without a prescription, with discreet delivery to the United Kingdom in 9â21 days.
Clinical effectiveness in the UK
Patients often ask how quickly Seroquel will help and what limits its benefit.
Clinically, reductions in hallucinations, agitation and mood instability are often seen within 1â4 weeks of starting treatment.
Functional improvement is variable and depends on adherence, psychosocial input and sideâeffect burden such as sedation and weight gain.
In inpatient settings quetiapine appears on many hospital formularies as a flexible option because of multiple dose strengths and both immediateârelease and XR preparations.
Routine effectiveness in NHS pathways relies on structured titration, monitoring of weight, lipids, liver function and blood pressure, and access to psychological and social interventions.
Common challenges include daytime somnolence affecting work and driving, and stigma associated with antipsychotic therapy.
- Typical outcomes: reduced psychosis and agitation, variable functional gains, sedation and weight gain commonly limit adherence.
- Pharmacist role: counselling on dosing, side effects and monitoring improves concordance.
| Formulation | Tolerability notes |
|---|---|
| Immediateârelease | Flexible dosing; may cause daytime sedation if doses spread across day |
| Prolongedârelease (XL) | Single bedtime dose; may cause less morning sedation |
Indications and expanded uses
Patients ask whether seroquel is licensed for their condition and when offâlabel use is acceptable.
UK licensed indications include treatment of schizophrenia in adults, bipolar disorder (acute mania and bipolar depression) and adjunctive therapy in major depressive disorder.
Common offâlabel use in UK practice includes shortâterm prescription for severe insomnia or anxiety when other options have failed, but local trust formularies generally caution against routine use for sleep because of sedation and metabolic risk.
Quetiapine is not licensed for dementiaârelated psychosis and should be avoided in this setting due to increased mortality risk.
- Licensed uses
- Schizophrenia, acute mania, bipolar depression, adjunct in major depressive disorder (with specific XR dosing options).
- Common offâlabel uses
- Shortâterm management of severe insomnia or anxiety where alternatives have failed; document clinical rationale and obtain informed consent.
| Indication | Typical target dose |
|---|---|
| Schizophrenia (Adults) | 300â400mg/day |
| Bipolar Mania | ~400mg/day |
| Bipolar Depression | 300mg at bedtime |
| Adjunct in depression (XL) | 50â150/300mg at bedtime |
Composition and brand landscape
People frequently ask whether branded seroquel differs from generic quetiapine.
The active ingredient in all formulations is quetiapine (INN).
Major UK brand formulations are Seroquel (immediateârelease tablets 25â400mg) and Seroquel XL (prolongedârelease 50â400mg).
Besides the originator AstraZeneca, generics are available from multiple manufacturers, including Teva, Sandoz, Torrent, Sun Pharma, Aurobindo, Mylan, Dr. Reddyâs and Accord Healthcare.
Packaging in the UK commonly uses blister packs of 10, 30, 60 or 100 tablets.
ATC classification N05AH04 places quetiapine among atypical antipsychotics and guides formulary placement in hospitals.
| Brand / generic | Available strengths | Typical pack sizes |
|---|---|---|
| Seroquel (brand) | 25, 50, 100, 150, 200, 300, 400mg | 10, 30, 60, 100 |
| Seroquel XL (brand) | 50, 150, 200, 300, 400mg | 10, 30, 60 |
| Generic quetiapine | Same strengths as branded | 10, 30, 60, 100 |
Contraindications and special precautions
Common safety worries include dementia, heart problems and pregnancy.
- Absolute contraindication: Known hypersensitivity to quetiapine or any excipient.
- Dementiaârelated psychosis: Not to be used because of increased mortality risk.
- Major precautions: Significant cardiovascular disease, arrhythmias, severe liver impairment, seizure disorders and history of neutropenia/leucopenia.
- Metabolic risks: Diabetes or risk factors for metabolic syndrome require baseline and periodic weight, lipid and glucose monitoring.
- Pregnancy & Breastfeeding: Requires specialist riskâbenefit discussion and documentation if used.
- Lifestyle restrictions: Avoid alcohol because it enhances sedation; caution when driving until effects are known; orthostatic hypotension risk when standing quickly.
Safety monitoring: the MHRA Yellow Card scheme monitoring captures suspected adverse reactions in realâworld UK practice and clinicians are encouraged to report serious or unexpected events.
Dosage guidelines
Patients commonly want clear starting steps and maximums.
Follow NHS and productâlabel titration regimes tailored to the indication and formulation.
Schizophrenia in adults typically starts at 25mg twice daily titrated to a target of 300â400mg/day, given in two or three divided doses.
Acute bipolar mania often starts at 50mg twice daily and may be increased to around 400mg by Day 4.
Bipolar depression is usually titrated to 300mg at bedtime, while adjunctive treatment in depression with XR commonly begins at 50mg at night and may be increased to 150â300mg XR.
Maximum licensed doses can reach up to 800mg in some indications, but usual upper limits for depression indications are lower.
Special populations: quetiapine is not licensed for children and adolescents under 18 in the UK.
Elderly patients should start very low (for example 25mg/day) and titrate cautiously.
| Indication | Starting dose | Target / max |
|---|---|---|
| Schizophrenia (Adults) | 25mg twice daily | 300â400mg/day; max 800mg |
| Bipolar Mania | 50mg twice daily | ~400mg by Day 4; max 800mg |
| Bipolar Depression | 50mg once daily | 300mg at bedtime; max 300mg |
Handling note: do not crush XL tablets; store 15â30°C.
Interactions overview
Many patients ask whether seroquel will clash with their other medicines.
Quetiapine is metabolised predominantly by CYP3A4 in the liver, so inhibitors and inducers of this enzyme alter plasma concentrations.
CYP3A4 inhibitors such as ketoconazole or strong antivirals can raise quetiapine levels and may require dose adjustments or close monitoring.
CYP3A4 inducers such as carbamazepine or St Johnâs wort can reduce quetiapine exposure and may decrease clinical effect.
Avoid or use caution with other strong sedatives because of additive sedation and respiratory depression risk.
Concomitant use of QTâprolonging drugs increases arrhythmia risk and an ECG may be indicated in atârisk patients.
| Interaction type | Examples | Clinical action |
|---|---|---|
| CYP3A4 Inhibitors | Ketoconazole, some macrolides, ritonavir | May raise quetiapine levels; monitor and consider dose reduction |
| CYP3A4 Inducers | Carbamazepine, St Johnâs wort | May lower levels; monitor efficacy and consider dose increase |
| Additive CNS Depressants | Opioids, benzodiazepines, alcohol | Increased sedation; avoid combination where possible |
Pharmacists should check interactions on dispensing systems and counsel patients on OTC and herbal remedies.
Comparable medicines and preferences
Clinicians choose antipsychotics by balancing efficacy against sideâeffect profiles for each patient.
Common alternatives on NHS formularies include risperidone, olanzapine, aripiprazole, lurasidone and clozapine for treatmentâresistant cases.
Olanzapine tends to have higher metabolic risk, risperidone more prolactin and extrapyramidal effects, and aripiprazole is often chosen when lower sedation or weight gain is desired.
Clozapine remains reserved for refractory schizophrenia due to monitoring requirements.
Quetiapine is often preferred when sedation or sleep benefit is desired or when flexible dosing is required because of IR and XR availability.
| Agent | Efficacy | Metabolic risk | Sedation | Licence notes |
|---|---|---|---|---|
| Quetiapine (Seroquel) | Effective in schizophrenia and bipolar | Moderate | Moderate to high (dose dependent) | IR and XR available |
| Olanzapine | Effective | High | High | Licensed for schizophrenia, bipolar |
| Aripiprazole | Effective | Lower | Low | Licensed for multiple indications |
Frequently asked questions
Q: Will quetiapine make me gain weight?
A: Weight gain is common and baseline plus periodic weight, lipid and glucose monitoring are recommended.
Q: Can I drive while taking it?
A: Avoid driving until you know how sedation affects you and inform DVLA if your condition or treatment affects driving ability.
Q: What if I miss a dose?
A: Take as soon as you remember unless close to the next dose; do not double up.
Q: Is overdose dangerous?
A: Overdose can cause drowsiness, tachycardia, hypotension or coma and requires emergency medical attention.
Signposts: report suspected adverse reactions to the MHRA Yellow Card scheme and seek pharmacist counselling or NHS services for medication queries.
Guidelines for proper use
Good followâup and counselling make treatment safer and more effective.
Pharmacist counselling and NHS outpatient followâup should cover the indication, expected timeline of benefit and exact dosing and titration schedule including XR handling.
Advise patients on sedation and driving, alcohol avoidance and the metabolic monitoring schedule for weight, BP, lipids, glucose and LFTs.
Discuss contraception and pregnancy planning where relevant and document informed consent for any offâlabel use such as shortâterm sleep prescribing.
Use sharedâcare agreements where appropriate and record monitoring responsibilities between primary and secondary care.
Community pharmacists can perform brief medication reviews, set reminders via NHS patient portals and liaise with GPs to close monitoring loops.
| Monitoring item | Timing |
|---|---|
| Weight/BMI | Baseline, 4â12 weeks, then periodically |
| Lipids & Glucose | Baseline and at regular intervals (e.g. 3 months then annually) |
| Blood Pressure | Baseline and during titration |
Delivery across the United Kingdom
| City | Region | Delivery Time |
|---|---|---|
| London | Greater London | 9â21 days |
| Birmingham | West Midlands | 9â21 days |
| Manchester | Greater Manchester | 9â21 days |
| Glasgow | Scotland | 9â21 days |
| Edinburgh | Scotland | 9â21 days |
| Leeds | West Yorkshire | 9â21 days |
| Liverpool | Merseyside | 9â21 days |
| Bristol | South West England | 9â21 days |
| Sheffield | South Yorkshire | 9â21 days |
| Newcastle Upon Tyne | North East England | 9â21 days |
| Nottingham | Nottinghamshire | 9â21 days |
| Leicester | Leicestershire | 9â21 days |
| Belfast | Northern Ireland | 9â21 days |
| Cardiff | Wales | 9â21 days |
