supplementNot FDA-approvedOTC supplementProlonged-release melatonin (Circadin) is approved by the EMA as a prescription medicine for insomnia in adults 55 and olderIn the US, melatonin is sold as an unregulated dietary supplement, not as an FDA-approved drug
Melatonin (Extended Release)Benefits, Dosage & Interactions
Also known as: ER Melatonin
Melatonin is a hormone naturally produced by the pineal gland in the brain. It plays a crucial role in regulating the body's sleep-wake cycle, also known as the circadian rhythm. Research on Melatonin (Extended Release) focuses on sleep quality. It is typically taken in the evening.
Researched by DoseRoutine R&D TeamReviewed for accuracy by Nicholas Alexander, RSELast updated
Evidence: Strong — 2 human randomized trials and regulatory approval on file.
Evidence strengthStrong · 4/4
PreclinicalStrong human evidence
2 human randomized trials and regulatory approval on file.
Plasma half-life
Not applicable
Typical timing
bedtime
Default unit
mg
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
- Reported amounts
- The pharmacokinetic crossover trial compared a 2 mg extended-release formulation against a 5 mg immediate-release dose; the elderly psychomotor study used a 2 mg prolonged-release tablet[1][2]
Reported for Melatonin (Extended Release) in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the Melatonin (Extended Release) entry is written from. Each number matches an inline marker above.
- [1]A Randomized, Double-Blind, Crossover Study to Investigate the Pharmacokinetics of Extended-Release Melatonin Compared to Immediate-Release Melatonin in Healthy AdultsMun JG, Wang D, Doerflein Fulk DL, Fakhary M, Gualco SJ, Grant RW, Mitmesser SH · Journal of Dietary Supplements · 2024 · Peer-reviewed · PMID 37150895
- [2]Effects of prolonged-release melatonin, zolpidem, and their combination on psychomotor functions, memory recall, and driving skills in healthy middle aged and elderly volunteersOtmani S, Demazières A, Staner C, Jacob N, Nir T, Zisapel N, Staner L · Human Psychopharmacology · 2008 · Peer-reviewed · PMID 18763235
- [3]Protocol MelatoSom-Kids-PTSD: sleep disturbances in children and adolescents with post-traumatic stress disorder (PTSD) - a randomized double-blind placebo-controlled trial to investigate the efficacy of paediatric prolonged-release melatoninRolling J, Reynaud E, Mengin AC, Zanfonato T, Bourgin P, Schroder CM · European Journal of Psychotraumatology · 2025 · Peer-reviewed · PMID 40243149
How to track Melatonin (Extended Release) doses
Tracking Melatonin (Extended Release) well takes four fields and a habit. Here is what to record so the log is still useful in three months.
- 1
Add the dose and unit
Log Melatonin (Extended Release) with its dose in mg so totals stay comparable over time — including days when you split the dose or skip it.
- 2
Set the time of day and food rule
Typical timing is bedtime. Reminders fire at that time and can export to your calendar.
- 3
Check it against the rest of the stack
Run Melatonin (Extended Release) through the interaction checker against everything else in the routine — supplements, peptides, hormones and prescriptions — before it becomes a daily habit.
- 4
Log adherence, not intentions
Mark each dose taken, skipped or delayed as it happens. Weeks of honest logs are what make an adherence rate or a trend line meaningful; retrospective guessing is not.
- 5
Review against outcomes
Review Melatonin (Extended Release) alongside your logged metrics and any relevant blood work every few weeks before changing the dose, so the change is a response to data rather than to a good or bad day.
What to log each time
- Dose in mg
- Time of day
- Taken / skipped / delayed
- Any side effects or notable changes
What is Melatonin (Extended Release) studied for?
What is Melatonin (Extended Release)?
Melatonin is a hormone naturally produced by the pineal gland in the brain. It plays a crucial role in regulating the body's sleep-wake cycle, also known as the circadian rhythm. Melatonin levels typically rise in the evening, promoting sleep, and decrease in the morning. Extended-release (ER) formulations of melatonin are designed to release the hormone gradually over several hours, mimicking the body's natural melatonin production profile throughout the night, aiming to help individuals maintain sleep. Standard or immediate-release melatonin formulations, conversely, release the hormone quickly and are primarily intended to shorten the time it takes to fall asleep.
Melatonin is available as a dietary supplement in many countries. It is commonly used to address various sleep disturbances, including difficulty falling asleep (insomnia), jet lag, and shift work disorder. The extended-release form is particularly investigated for its potential to improve sleep maintenance, as opposed to just sleep onset. (NIH ODS)
What does the research say about Melatonin (Extended Release)?
Tap a section to expand.
Melatonin primarily exerts its effects by binding to specific melatonin receptors, principally MT1 and MT2, located in the suprachiasmatic nucleus (SCN) of the hypothalamus, which is the body's master clock. Activation of MT1 receptors contributes to the sleep-promoting effects by inhibiting neuronal firing in the SCN. Activation of MT2 receptors is involved in shifting the phase of the circadian rhythm. By modulating these receptors, melatonin helps to regulate the timing of sleep and wakefulness.
Extended-release melatonin formulations are designed to maintain elevated melatonin levels in the blood for a longer duration compared to immediate-release formulations. This sustained release aims to provide a more prolonged signal to the brain, theoretically supporting sleep maintenance throughout the night, similar to endogenous melatonin secretion patterns. This controlled release profile is intended to more closely replicate the physiological nocturnal melatonin rhythm, potentially offering benefits for individuals who struggle with waking up during the night. (DrugBank, PubChem)
Extended-release melatonin is primarily used for its potential to improve various aspects of sleep. Specific benefits investigated include:
* **Improving sleep maintenance:** By providing a sustained release of melatonin, ER formulations aim to help individuals stay asleep longer and reduce awakenings during the night. This is in contrast to immediate-release melatonin, which primarily focuses on reducing the time to fall asleep.
* **Addressing primary insomnia (for sleep maintenance):** Some clinical studies have explored the efficacy of ER melatonin in individuals experiencing chronic difficulty staying asleep, particularly in older adults where natural melatonin production often declines.
* **Regulating sleep-wake cycles in specific populations:** While immediate-release melatonin is more commonly cited for jet lag or shift work, the sustained action of ER forms may have applications in certain circadian rhythm sleep disorders where prolonged hormonal signaling is beneficial, though specific research on ER for these conditions might vary.
It's important to note that the effectiveness can vary among individuals, and the scientific evidence base for all listed benefits is continuously evolving. (Cochrane, MedlinePlus)
Research on extended-release melatonin has focused on its utility in sleep disorders, particularly difficulties with sleep maintenance. A meta-analysis published in the *Cochrane Database of Systematic Reviews* has examined melatonin's role in primary sleep disorders. While immediate-release melatonin is often cited for sleep onset, extended-release formulations have been specifically studied for their effects on sleep duration and reducing nocturnal awakenings, especially in older adults, who often experience decreased endogenous melatonin production. Some studies indicate that ER melatonin may be effective in improving sleep quality and morning alertness in certain populations with primary insomnia, though findings can vary.
Clinical trials, for example, have investigated specific extended-release melatonin products' ability to improve sleep efficiency and reduce the number of awakenings in patients with primary insomnia. The European Medicines Agency (EMA) has approved at least one extended-release melatonin product for short-term treatment of primary insomnia characterized by poor sleep quality in patients aged 55 and over. This regulatory approval reflects a level of established efficacy and safety for that specific formulation within that demographic. (Cochrane, EMA SmPC)
While melatonin is generally considered safe for short-term use, some individuals may experience side effects with extended-release forms. Common side effects can include:
* Drowsiness or sleepiness (especially the morning after use)
* Headache
* Dizziness
* Nausea
* Fatigue
Less common side effects might include short-term feelings of depression, mild anxiety, tremors, abdominal cramps, irritability, and reduced alertness. In rare cases, more significant side effects such as nightmares or vivid dreams have been reported. It's also possible to experience next-day grogginess, especially if taken too late or at a higher dose than necessary. Because of the extended release, some individuals may feel these effects for a longer duration compared to immediate-release formulations. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Individuals taking extended-release melatonin should be aware of several warnings:
* **Daytime drowsiness:** Due to its prolonged action, extended-release melatonin may cause next-day drowsiness, which can impair the ability to drive or operate heavy machinery safely. Caution is advised until you know how it affects you.
* **Use in specific populations:** Pregnant or breastfeeding individuals should avoid melatonin due to insufficient research on its safety in these populations. Individuals with autoimmune diseases, seizure disorders, or depression should consult a healthcare professional before use, as melatonin may interact with these conditions or their treatments.
* **Hormonal effects:** Melatonin is a hormone, and its long-term effects on the endocrine system are not fully understood. It may affect other hormones, including reproductive hormones.
* **Masking medical conditions:** Melatonin can temporarily improve sleep symptoms, potentially masking an underlying medical condition causing the sleep disturbance.
Always discuss with a healthcare provider before starting any new supplement, especially if you have existing health conditions or are taking other medications. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Extended-release melatonin is generally contraindicated for use in individuals with known hypersensitivity to melatonin or any of its excipients. While not absolute contraindications, certain medical conditions warrant extreme caution and consultation with a healthcare professional before use:
* **Autoimmune diseases:** Melatonin may exacerbate certain autoimmune conditions due to its effects on the immune system.
* **Seizure disorders:** There is some concern that melatonin could potentially lower the seizure threshold in susceptible individuals.
* **Depression:** While melatonin is not typically seen as a direct cause, individuals with depression should use it cautiously as it can sometimes lead to depressive symptoms or interact with antidepressant medications, particularly extended-release formulations which have a prolonged effect.
* **Severe liver or kidney impairment:** Individuals with significantly impaired liver or kidney function may have altered melatonin metabolism, leading to increased plasma levels and potential for adverse effects. (EMA SmPC)
It is crucial to avoid self-prescribing and always seek professional medical advice. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Exercise caution when combining extended-release melatonin with certain medications and substances, as interactions can alter its effects or increase the risk of side effects:
* **Anticoagulants/Antiplatelet drugs:** Melatonin might increase the risk of bleeding in individuals taking blood thinners like warfarin. Due to the extended release, this effect could be sustained.
* **Immunosuppressants:** Given melatonin's potential immunomodulatory effects, it may interfere with the effectiveness of immunosuppressant medications.
* **Anticonvulsants:** Melatonin may increase the frequency of seizures in individuals taking anticonvulsants.
* **Diabetes medications:** Melatonin may affect blood sugar levels, potentially interfering with the effectiveness of diabetes medications.
* **Blood pressure medications:** Melatonin may lower blood pressure, which could lead to excessively low blood pressure when combined with antihypertensive drugs.
* **Central nervous system (CNS) depressants:** Combining melatonin with alcohol, sedatives, benzodiazepines, or other sleep aids can lead to increased drowsiness and impaired coordination, given the prolonged sedative effect of extended-release formulations.
* **Fluvoxamine:** This antidepressant can significantly increase melatonin levels by inhibiting its metabolism, potentially leading to exaggerated effects and side effects.
* **Caffeine:** Caffeine is a stimulant that can counteract the sedative effects of melatonin.
* **Contraceptives:** Some evidence suggests that oral contraceptives might increase endogenous melatonin levels, which could theoretically interact with exogenous melatonin supplementation, though the clinical significance is not fully established.
Always consult a healthcare professional or pharmacist to review all medications and supplements you are taking before starting extended-release melatonin. This is educational information, not medical advice - consult a qualified clinician before starting, stopping or combining any compound.
Extended-release melatonin is typically taken about 30 minutes to 2 hours before bedtime. The precise timing can vary based on individual response and the specific formulation, but the goal is to allow the sustained release to begin acting as physiological melatonin levels naturally rise. For particular conditions like jet lag or shift work, timing recommendations would be user-directed and must be set by a licensed clinician to properly adjust the circadian rhythm. It can be taken with or without food. (Mayo Clinic)
What interacts with Melatonin (Extended Release)?
| Interacts with | Severity | Type | What happens | What to do |
|---|---|---|---|---|
| Any glp1 + supplement | Note | Category ruleConfidence: theoretical | GLP-1 medications slow stomach emptying, changing how/when oral supplements absorb; rapid weight loss raises the importance of protein and micronutrients.Source pending | Time oral supplements when nausea is lowest; prioritize protein and micronutrients; discuss with your provider. |
| Any supplement + medication | Note | Category ruleConfidence: theoretical | Some supplements change how the body processes medications (absorption, liver enzymes, or additive effects).Source pending | Specific pairs are checked against a licensed drug database and shown with their own severity. Always confirm with your provider or pharmacist. |
Frequently asked questions about Melatonin (Extended Release)
Melatonin (Extended Release) is a supplement. It is also known as ER Melatonin. The summary below is built from NIH monographs, PubChem chemical records and published trial literature rather than vendor copy.
Melatonin (Extended Release) is commonly discussed in the context of supporting sleep. Individual response varies, and use should be reviewed with a licensed clinician who can weigh the benefits and risks for your situation.
For Melatonin (Extended Release), it is typically taken in the evening. Always follow the specific dose your clinician or the product label prescribes.
Melatonin (Extended Release) carries potential side effects and drug interactions, documented in NIH, Mayo Clinic, and FDA label sources. Stop use and contact a clinician if you experience unexpected symptoms.
Interaction risk for Melatonin (Extended Release) comes from the rest of the stack: other supplements, prescription medicines, hormone therapy and peptides. Because Melatonin (Extended Release) is usually taken in the evening, most avoidable conflicts come from what else lands in that same window. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers Melatonin (Extended Release) with no sign-up.
There is no single answer for Melatonin (Extended Release) plus TRT. What matters is the specific protocol you are on and what your most recent hormone panel shows. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
Pairing Melatonin (Extended Release) with peptides has to be assessed one peptide at a time, because GLP-1 agonists, secretagogues, healing peptides and melanocortins do not share an interaction profile. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
Published frequency for Melatonin (Extended Release) varies by protocol and formulation, so the label or prescription is what sets it. It is typically taken in the evening. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
The effect of a missed dose of Melatonin (Extended Release) depends on the protocol and formulation you are on. Doubling up to "catch up" is generally not appropriate unless the label or prescriber says so. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For Melatonin (Extended Release) the useful record is the dose, the time it was actually taken, and what else was taken in the same window. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
Verify at
Publisher search links for Melatonin (Extended Release). These are places to check the information — they are not citations, so they are not numbered.
- NIH Office of Dietary Supplements(publisher search, opens in a new tab)National Institutes of Health · publisher search
- MedlinePlus(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- PubChem(publisher search, opens in a new tab)National Center for Biotechnology Information · publisher search
- Mayo Clinic(publisher search, opens in a new tab)Mayo Clinic · publisher search
- European Medicines Agency(publisher search, opens in a new tab)European Medicines Agency · publisher search
- Cochrane Library(publisher search, opens in a new tab)Cochrane · publisher search
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- DailyMed labeling archive(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on Melatonin (Extended Release)?
Plain-text summary, safe to quote verbatim:
Melatonin is a hormone naturally produced by the pineal gland in the brain. It plays a crucial role in regulating the body's sleep-wake cycle, also known as the circadian rhythm. Research on Melatonin (Extended Release) focuses on sleep quality. It is typically taken in the evening.
Source: DoseRoutine — https://doseroutine.com/library/melatonin-extended-release
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Melatonin (Extended Release) — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/melatonin-extended-release
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