chemistry

Quetiapine

Quetiapine is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Quetiapine rather than just read about it. In short: Quetiapine ( kwi-TY-ə-peen), sold under the brand name Seroquel among others, is a medication of the atypical antipsychotic class. It is used in the treatment of schizophrenia, bipolar disorder, and major depressive disorder.

Key takeaways

Quetiapine belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Quetiapine to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Quetiapine from memory before moving on to harder problems.

Reference excerpt

Quetiapine ( kwi-TY-ə-peen), sold under the brand name Seroquel among others, is a medication of the atypical antipsychotic class. It is used in the treatment of schizophrenia, bipolar disorder, and major depressive disorder. Quetiapine is also widely prescribed off-label as a sleep aid for its tranquillizing effects. Some have raised concerns that the undesirable side effects from off-label use may outweigh its benefits, though this remains an active area of research. It is taken orally. Common side effects include sedation, fatigue, weight gain, constipation, and dry mouth. Other side effects include low blood pressure with standing, seizures, high blood sugar, tardive dyskinesia, and neuroleptic malignant syndrome. In older people with dementia, its use increases the risk of death. Use in the third trimester of pregnancy may result in a movement disorder in the baby for some time after birth. Quetiapine is believed to work by blocking a number of receptors, including those for serotonin and dopamine. Quetiapine was developed in 1985 and was approved for medical use in the United States in 1997. It is available as a generic medication. In 2023, it was the most prescribed antipsychotic and 60th most commonly prescribed medication in the United States, with more than 10 million prescriptions. It is on the World Health Organization's List of Essential Medicines. The drug is typically among two antipsychotics (the other being olanzapine) to have superior efficacy for the treatment of bipolar disorder. Quetiapine is one of only two antipsychotics (the other is cariprazine) that produce equal efficacy as standalone therapies for mixed manic-depressive mood swings as they do in combination with an SSRI antidepressant. However, it is less potent than clozapine, amisulpride, olanzapine, risperidone, and paliperidone in alleviating psychotic symptoms or treating schizophrenia.

Medical uses

Quetiapine is primarily used to treat schizophrenia and bipolar disorder. It targets both positive and negative symptoms of schizophrenia.

Schizophrenia A 2013 Cochrane review compared quetiapine to typical antipsychotics:

In a 2013 comparison of 15 antipsychotics in effectiveness in treating schizophrenia, quetiapine demonstrated standard effectiveness. It was 13–16% more effective than ziprasidone, chlorpromazine, and asenapine and approximately as effective as haloperidol and aripiprazole. There is tentative evidence of the benefit of quetiapine versus placebo in schizophrenia; however, definitive conclusions are not possible due to the high rate of attrition in trials (greater than 50%) and the lack of data on economic outcomes, social functioning, or quality of life. It is debatable whether, as a class, typical or atypical antipsychotics are more effective. Both have equal drop-out and symptom relapse rates when typicals are used at low to moderate dosages. While quetiapine has lower rates of extrapyramidal side effects, there is greater sleepiness and rates of dry mouth. A Cochrane review comparing quetiapine to other atypical antipsychotic agents tentatively concluded that it may be less efficacious than olanzapine and risperidone; produce fewer movement related side effects than paliperidone, aripiprazole, ziprasidone, risperidone and olanzapine; and produce weight gain similar to risperidone, clozapine and aripiprazole. It found that quetiapine produces suicide attempts; death; QTc prolongation, low blood pressure; tachycardia; sedation; gynaecomastia; galactorrhoea, menstrual irregularity, and decline in white blood cell count at a rate similar to first-generation antipsychotics.

Bipolar disorder In those with bipolar disorder, quetiapine is used to treat depressive episodes; acute manic episodes associated with bipolar I disorder (as either monotherapy or adjunct therapy to lithium; valproate or lamotrigine); acute mixed episodes; and maintenance treatment of bipolar I disorder (as adjunct therapy to lithium or divalproex).

Major depressive disorder Quetiapine is effective when used by itself and when used along with other medications in major depressive disorder (MDD), but sedation is often an undesirable side effect. In the United States, the United Kingdom and Australia (while not subsidised by the Australian Pharmaceutical Benefits Scheme for treatment of MDD), quetiapine is licensed for use as an add-on treatment in MDD.

Alzheimer's disease Quetiapine does not decrease agitation among people with Alzheimer's disease. Quetiapine worsens intellectual functioning in the elderly with dementia and therefore is not recommended.

Insomnia Low doses of quetiapine are commonly prescribed for insomnia. Use for insomnia can present side effects and is an area of concern regarding its off-label use. A 2022 network meta-analysis of 154 double-blind, randomized controlled trials of drug therapies vs. placebo for insomnia in adults found that quetiapine did not demonstrate any short-term benefits in sleep quality. Quetiapine, specifically, had an effect size (standardized mean difference) against placebo for treatment of insomnia of 0.05 (95% CITooltip confidence interval –1.21 to 1.11) at 4 weeks of treatment, with the certainty of evidence rated as very low. Doses of quetiapine used for insomnia have ranged from 12.5 to 800 mg, with low doses of 25 to 200 mg being the most typical. Regardless of the dose used, some of the more serious adverse effects may still possibly occur at the lower dosing ranges, such as dyslipidemia and neutropenia. Increases in serum triglycerides, LDL-C, and fasting blood glucose have been observed following quetiapine treatment at doses typically used off-label in the treatment of insomnia. These safety concerns at low doses are corroborated by Danish observational studies that showed use of specifically low-dose quetiapine (prescriptions filled for tablet strengths >50 mg were excluded) was associated with an increased risk of major cardiovascular events as compared to use of Z-drugs, with most of the risk being driven by cardiovascular death. Laboratory data from an unpublished analysis of the same cohort also support the lack of dose-dependency of metabolic side effects, as new use of low-dose quetiapine was associated with a risk of increased fasting triglycerides at 1-year follow-up.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Quetiapine

Start with the simplest possible case. Write down what Quetiapine claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Quetiapine before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Quetiapine ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Quetiapine

In research: Quetiapine appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Quetiapine in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Quetiapine is common in secondary-school and first-year university syllabi. It links to neighbouring topics 5-HT2A antagonists, Alpha-1 blockers, Alpha-2 blockers, so understanding it makes those chapters shorter.
In everyday life: Look for Quetiapine outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Quetiapine in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Quetiapine means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Quetiapine out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Quetiapine in simple terms?

Why does Quetiapine matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Quetiapine?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Quetiapine.