Seroquel Tapering Guide
quetiapine
Boxed Warning
Increased mortality in elderly patients with dementia-related psychosis. Suicidality risk in children, adolescents, and young adults (for MDD adjunct indication).
Overview
Quetiapine is an atypical antipsychotic approved for schizophrenia, bipolar disorder (manic and depressive episodes), and as adjunctive treatment for major depressive disorder. It is widely prescribed off-label at low doses for insomnia and anxiety.
25mg, 50mg, 100mg, 200mg, 300mg
Immediate-release tablets: 25mg, 50mg, 100mg, 200mg, 300mg, 400mg; Extended-release tablets (XR): 50mg, 150mg, 200mg, 300mg, 400mg
Category C (risk cannot be ruled out)
Mechanism of Action
Antagonist at dopamine D2, serotonin 5-HT2A, histamine H1, and alpha-1 adrenergic receptors. Its active metabolite norquetiapine also inhibits the norepinephrine transporter. The strong H1 antagonism drives sedation; 5-HT2A/D2 ratio contributes to atypical antipsychotic profile.
Taper Notes
Often prescribed off-label for insomnia at low doses. Rebound insomnia and anxiety common during tapering. Tablets can be split.
Hyperbolic Tapering Guidance
Reduce by no more than 10% of current dose. At low doses (25–50mg) used for sleep, very slow final taper over months.
Summary written by TaperCommunity, informed by the Maudsley Deprescribing Guidelines (Horowitz & Taylor) and related literature — see Sources & References below. Not affiliated with or endorsed by the Maudsley.
Common Withdrawal Symptoms
Interactions & Safety
Drug Interactions
- CYP3A4 inhibitors (ketoconazole, erythromycin, nefazodone) significantly increase quetiapine levels — reduce quetiapine dose
- CYP3A4 inducers (phenytoin, carbamazepine, rifampin) decrease quetiapine levels significantly
- CNS depressants — additive sedation
Food Interactions
- High-fat meals increase XR formulation absorption
- Avoid alcohol (additive CNS depression)
- Grapefruit juice may increase levels via CYP3A4 inhibition
Contraindications
- Known hypersensitivity to quetiapine
Toxicity
Metabolic syndrome (weight gain, dyslipidemia, hyperglycemia, diabetes). Orthostatic hypotension. QT prolongation. Somnolence. Tardive dyskinesia with long-term use.
Pharmacokinetics
ADME Profile
Rapidly absorbed after oral administration. Tmax ~1.5 hours (IR), ~6 hours (XR). Bioavailability ~100% relative to oral solution. Food increases Cmax by ~25% for IR; high-fat food increases XR Cmax and AUC.
~10 L/kg
Extensively metabolized hepatically via CYP3A4 (primary) to the active metabolite norquetiapine and inactive sulfoxide metabolite.
Renal (~73%) and fecal (~20%). Less than 1% excreted unchanged.
~83%
~100 L/hr (apparent oral clearance)
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Other Drug Profiles
Sources & References
Seroquel (quetiapine) information on this page is sourced from peer-reviewed research, regulatory bodies, clinical guidelines, and patient-advocacy organizations.
Encyclopedic & chemical databases
Neutral, high-authority entity references.
Regulatory sources
Official prescribing information and safety notices.
Peer-reviewed research
Primary literature cited in this taper guide.
- Horowitz MA, Jauhar S, Natesan S, Murray RM, Taylor D 2021 — A method for tapering antipsychotic treatment that may minimize the risk of relapse (Schizophrenia Bulletin)
- Tranter R, Healy D 1998 — Antipsychotic withdrawal symptoms: phenomenology and pathophysiology (Journal of Psychopharmacology)
- Anderson SL, Vande Griend JP 2014 — Quetiapine for primary insomnia: a systematic review (American Journal of Health-System Pharmacy)
Clinical guidelines
Evidence-based deprescribing and prescribing standards.
Deprescribing-specific resources
Clinician-facing references on tapering protocols.
- Royal College of Psychiatrists — Stopping antipsychotics — UK clinical guidance on discontinuing antipsychotics
- Council for Evidence-Based Psychiatry (CEP UK) — Evidence-based critique of long-term antipsychotic prescribing
- Deprescribing.org — Antipsychotic deprescribing algorithm for insomnia and BPSD
Patient-advocacy & lived-experience
Long-running communities documenting withdrawal experience.
- Surviving Antidepressants — antipsychotic tapering forum — Community archive of Seroquel taper experiences
- Mad in America — antipsychotic archive — Independent journalism on quetiapine and antipsychotic withdrawal
- Inner Compass Initiative — Withdrawal Project — Peer-led psychiatric drug withdrawal resources
- RxISK — adverse drug reaction reporting — Independent database of quetiapine adverse-effect reports
TaperCommunity does not provide medical advice. Always consult a qualified prescriber before adjusting psychiatric medication.