chemistry

Melatonin as a medication and supplement

Melatonin as a medication and supplement 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 Melatonin as a medication and supplement rather than just read about it. In short: Melatonin is a naturally occurring hormone produced in the brain that is also used as a dietary supplement and medication. As a hormone, melatonin is released by the pineal gland and is involved in sleep–wake cycles.

Key takeaways

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

Reference excerpt

Melatonin is a naturally occurring hormone produced in the brain that is also used as a dietary supplement and medication. As a hormone, melatonin is released by the pineal gland and is involved in sleep–wake cycles. As a supplement and medication, it is often used for the short-term treatment of disrupted sleep patterns such as from jet lag or shift work, and is typically taken orally. Side effects from melatonin supplements are minimal at low doses for short durations (the studies reported that side effects occurred about equally for both melatonin and placebo). The most common side effects of using supplemental melatonin include headache, nausea, vivid dreams, and daytime drowsiness. Its use is not recommended during pregnancy or breastfeeding or for those with liver disease. Melatonin acts as an agonist of the melatonin MT1 and MT2 receptors, the biological targets of endogenous melatonin. It is thought to activate these receptors in the suprachiasmatic nucleus of the hypothalamus in the brain to regulate the circadian clock and sleep–wake cycles. Immediate-release melatonin has a short elimination half-life of about 20 to 50 minutes. Prolonged-release melatonin used as a medication has a half-life of 3.5 to 4 hours. Melatonin was discovered in 1958. It is sold over-the-counter in Canada and the United States; in the United Kingdom, it is a prescription-only medication. In Australia and the European Union, it is indicated for difficulty sleeping in people over the age of 54. Slenyto is a prolonged-release melatonin medicine used in the E.U. to treat insomnia in children and adolescents with autism spectrum disorder, neurogenetic disorders, or ADHD. The U.S. Food and Drug Administration (FDA) treats melatonin as a dietary supplement and, as such, has not approved it for any medical uses. It was approved for medical use in the European Union in 2007. Besides melatonin, certain synthetic melatonin receptor agonists like ramelteon, tasimelteon, and agomelatine are also used in medicine. In 2023, it was the 164th most commonly prescribed medication in the United States, with more than 3 million prescriptions.

Medical uses

Insomnia An extended-release pharmaceutical formulation of melatonin is approved under the brand name Circadin for the treatment of insomnia in certain settings, such as in people over 55 years of age. It is approved in the European Union, Israel, Australia, and countries in Asia and elsewhere in the world, but not in the United States (where it reached Phase III trials but was not approved). The medication has been licensed since 2007. Slenyto is a prolonged-release melatonin medicine used in the European Union to treat insomnia in children and adolescents with autism spectrum disorder, neurogenetic disorders, or ADHD. The 2023 European Insomnia Guideline recommended use of prolonged-release melatonin for treatment of insomnia in people age 55 or older for up to 3 months. It recommended against fast-release or over-the-counter melatonin for treatment of insomnia. These recommendations were based on several meta-analyses published in 2022 and 2023. The American Academy of Sleep Medicine's 2017 clinical practice guidelines recommended against the use of melatonin in the treatment of insomnia due to poor effectiveness and very low quality of evidence.

Circadian rhythm sleep disorders Melatonin may be useful in the treatment of delayed sleep phase syndrome. Melatonin is known to reduce jet lag, especially in eastward travel. However, if it is not taken at the correct time, it can instead delay adaptation. Melatonin appears to have limited use against the sleep problems of people who work shift work. Tentative evidence suggests that it increases the length of time people are able to sleep. Meta-analyses, published between 2005 and 2017, appear to show different results as to whether melatonin is effective for circadian rhythm sleep disorders or not. Some found that it was effective, while others found no evidence of effectiveness. Meta-analyses of melatonin for delayed sleep phase syndrome that found it effective have reported that it improves time to sleep onset by about 40 minutes (0.67 hours) and advances onset of endogenous melatonin secretion by about 1.2 hours (72 minutes). One meta-analysis found that melatonin was notably more effective in improving sleep onset latency in people with delayed sleep phase syndrome than in people with insomnia (improvement of 39 minutes vs. 7 minutes, respectively). One meta-analysis found that melatonin was probably effective for jet lag syndrome. Low doses of melatonin may be advantageous to high doses in the treatment of sleep-cycle disorders.

REM sleep behavior disorder Melatonin is a safer alternative than clonazepam in the treatment of REM sleep behavior disorder – a condition associated with the synucleinopathies like Parkinson's disease and dementia with Lewy bodies. However, clonazepam may be more effective. In any case, the quality of evidence for both treatments is very low and it is unclear whether either is definitely effective.

Available forms

A prolonged-release 2 mg oral formulation of melatonin sold under the brand name Circadin is approved for use in the European Union in the short-term treatment of insomnia in people age 55 and older. Melatonin is also available as an over-the-counter dietary supplement in many countries. It is available in both immediate-release and less commonly prolonged-release forms. The compound is available in supplements at doses ranging from 0.3 mg to 10 mg or more. It is also possible to buy raw melatonin powder by weight. Immediate-release formulations of melatonin cause blood levels of melatonin to reach their peak in about an hour. The hormone may be administered orally, as capsules, gummies, tablets, oral films, or as a liquid. It is also available for use sublingually, or as transdermal patches. Several inhalation-based melatonin products with a wide range of doses are available but their safety remains to be evaluated. The American Academy of Sleep Medicine (AASM) says that the melatonin content in unregulated (without a USP verified mark) supplements can diverge widely from the claimed amount; a study found that the melatonin content ranged from one half to four times the stated dose.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Melatonin as a medication and supplement

Start with the simplest possible case. Write down what Melatonin as a medication and supplement 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 Melatonin as a medication and supplement 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 Melatonin as a medication and supplement 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 Melatonin as a medication and supplement

In research: Melatonin as a medication and supplement 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 Melatonin as a medication and supplement 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: Melatonin as a medication and supplement is common in secondary-school and first-year university syllabi. It links to neighbouring topics 5-Methoxytryptamines, Acetamides, Antidepressants, so understanding it makes those chapters shorter.
In everyday life: Look for Melatonin as a medication and supplement 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 Melatonin as a medication and supplement in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Melatonin as a medication and supplement 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 Melatonin as a medication and supplement out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Melatonin as a medication and supplement in simple terms?

Why does Melatonin as a medication and supplement 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 Melatonin as a medication and supplement?

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 Melatonin as a medication and supplement.