🩺 NHS Description
Quetiapine is a medicine that helps with mental health conditions such as: schizophrenia, where you may see, hear or feel things that are not there or you believe things that are not true, or you feel unusually suspicious or have muddled thoughts the mania symptoms of bipolar disorder, where your mood changes between feeling highly excited (mania) and very low (depression) depression in bipolar disorder depression (quetiapine is only used together with other medicines for depression) It can help to prevent mania and depression if you have bipolar disorder. It's an antipsychotic medicine that works by affecting chemicals in your brain such as dopamine and serotonin. It does not cure your condition, but it can help with the symptoms. Quetiapine is only available on prescription. It comes as tablets, including slow release tablets (these may have XL in the brand name), and as a liquid that you swallow.
🩺 Main Uses
Schizophrenia; bipolar mania/depression; adjunct in major depression. Not a first‑line sleeper.
🧪 The Science & Facts
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Half‑life (t½)
6 h
How long the drug hangs around. Longer half‑life = slower changes.
Time to Peak (Tmax)
1.5 h
Roughly when you feel the main effect after a dose.
What it hits (receptors)
Primary:
Sedation largely from H1 + α1; D2 occupancy is relatively low.
How your body processes it (metabolism)
No meaningful effect on levels reported; smoking does not alter PK in studies. • Avoid strong CYP3A4 inhibitors/inducers; norquetiapine is active metabolite.
⚠️ Warnings
- Can cause daytime sedation, emotional blunting, weight gain, constipation, or restless legs. High doses may increase suicide risk. Very easy to misuse for sleep.
⏬ Taper & Withdrawal
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If you’re reducing
Reduce slowly (e.g., 10% of current dose every 2–4 weeks) to limit rebound insomnia/anxiety.
Possible withdrawal
Common: rebound insomnia/anxiety; Possible: nausea, dizziness, agitation.
Info here is educational, not medical advice. Always taper with prescriber support if possible.
🧠 Trusted External Sources Last reviewed 22 Aug 2025, 21:01 by Connor O’Driscoll
🔗 Interaction Checker
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Class warning: ↑ risk of death in older adults with dementia‑related psychosis. Do not use for behavioural problems in dementia.
This is a plain‑English summary of headline safety warnings. Talk to a clinician before changing any medication.