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Extended-Release Melatonin

A timed-release formulation designed to mimic the overnight melatonin curve rather than deliver one early spike. The best data are in adults over 55, where it modestly improves sleep quality and morning alertness; the effect sizes remain small.

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What the science says

  • Sleep quality in adults aged 55 and over Moderate evidence

    A randomised placebo-controlled trial in insomnia patients aged 55–80 found that 2 mg prolonged-release melatonin improved self-rated sleep quality and next-morning alertness. A later pooled analysis of the same programme confirmed that responses were consistent above roughly age 55 and less so below it.

  • Overall efficacy in insomnia disorder Moderate evidence

    A systematic review and meta-analysis of melatonin and ramelteon in adult insomnia disorder found statistically significant but small improvements in sleep latency and sleep quality, with limited data on long-term outcomes. Extended-release forms were not clearly superior to immediate-release for falling asleep.

  • Staying asleep through the night Limited evidence

    The rationale for the extended-release format is maintaining sleep rather than initiating it, but direct head-to-head trials against immediate-release melatonin on wake-after-sleep-onset are few and small. The advantage is theoretically sound but not firmly demonstrated.

Dosage & safety

Studied dose2 mg taken 1–2 hours before bedtime, the dose used in the prolonged-release trials. It is a prescription medicine in several countries and an over-the-counter supplement in others.
SafetyWell tolerated in trials up to 6–12 months, with headache and next-day sleepiness the most common effects. Do not crush or chew, as this destroys the release profile. Fluvoxamine and other CYP1A2 inhibitors, plus oral contraceptives, sharply raise melatonin blood levels; smoking lowers them. Caution with sedatives, anticoagulants and in autoimmune disease; discuss before use in pregnancy or breastfeeding.

How to take it

Timing1-2 hours before bedtime, at the same time nightly - the whole point of the formulation is a sustained overnight profile.
With food?After food, which is how it was dosed in the prolonged-release trials and on the licensed product's label.
Worth knowingNever crush, chew or split the tablet - that destroys the release profile and turns a 2 mg overnight dose into a 2 mg spike.

Interactions

With medications

  • fluvoxamine and other CYP1A2 inhibitors such as ciprofloxacin

    They sharply raise melatonin blood concentrations by blocking its clearance. do not combine without prescriber supervision

  • oral contraceptives containing ethinylestradiol

    They inhibit the same enzymes and substantially increase melatonin exposure. start at the lowest dose and expect a stronger effect than the label implies

  • benzodiazepines, z-drugs and other sedatives

    Additive sedation, particularly relevant with a formulation designed to keep levels up through the night. do not combine without medical supervision

  • warfarin and other anticoagulants

    Data are thin but altered clotting has been reported. tell your prescriber before starting

With other supplements

  • other sedative supplements such as valerian, kava or immediate-release melatonin

    Additive sedation and a duplicated melatonin dose. do not stack immediate-release and extended-release melatonin

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does extended-release melatonin work better than regular melatonin?

Not clearly. Extended-release melatonin has moderate evidence for improving sleep quality and morning alertness in adults over 55, but reviews found it was not clearly better than immediate-release for falling asleep, and head-to-head data on staying asleep are few and small.

Who benefits most from extended-release melatonin?

Adults aged 55 and over: trials of 2 mg prolonged-release melatonin in insomnia patients aged 55-80 found improved sleep quality and next-morning alertness, with responses less consistent in younger people. The effect sizes are small.

When should I take extended-release melatonin?

Take 2 mg of extended-release melatonin 1-2 hours before bedtime, after food, at the same time each night. Never crush, chew or split the tablet, as that destroys the release profile.

What interacts with extended-release melatonin?

Fluvoxamine, ciprofloxacin and other CYP1A2 inhibitors, and oral contraceptives, sharply raise melatonin levels, while smoking lowers them. Avoid combining extended-release melatonin with sedatives and tell your prescriber if you take anticoagulants.

Scientific references

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