Quetiapine
Prescription status is set country by country — the label where you live is the one that applies.
Beta: the medication section is still being tested, and its data may contain errors. Do not rely on it for a decision about your own treatment.
Quetiapine is an atypical antipsychotic that blocks dopamine and serotonin receptors, and its strong antihistamine action accounts for the sedation seen at lower doses. In practice it is prescribed for depression, for anxiety, and for insomnia, often as an add-on rather than as a first choice. It is prescription-only.
A usual adult range, not a national label — the dose and the timing differ by country and by product.
Approved uses differ by country — some of these may be off-label or unapproved where you live.
It is usually taken at bedtime, with or without food, because drowsiness is the most predictable effect and can carry over into the next morning. Over longer use it can change body weight, raise blood glucose and shift cholesterol and triglycerides, which is why glucose, HbA1c and the lipid panel are checked periodically rather than once. It can also prolong the QT interval, so it matters that a doctor knows about every other medicine being taken, particularly other drugs that affect heart rhythm.
Fainting, palpitations or an irregular heartbeat need medical attention promptly, as do heavy thirst, frequent urination or rapid weight change. Sedation that does not fade, or worsening mood, is also a reason to see a doctor rather than adjust the drug alone.
Reference information, not medical advice. Discuss any change with your doctor.