Every week someone asks us why they can’t just buy melatonin here the way relatives in America do. It’s a fair question with an interesting answer — and it leads to the more useful one: who does melatonin actually help?
What melatonin is
Melatonin is the hormone your brain’s pineal gland releases as light fades, signalling to the body that night has arrived. It doesn’t sedate you the way zopiclone does — it’s closer to a “darkness signal” that tells your body clock it’s time for sleep. That distinction explains both its gentleness and its limits.
Why it’s prescription-only in the UK
In the US, melatonin is classed as a dietary supplement — which also means minimal regulation, and independent testing there has repeatedly found products containing far more or less melatonin than labelled. In the UK, melatonin is classified as a medicine: it must meet pharmaceutical manufacturing standards, and it requires a prescription. You get less convenience, but you get a product that contains exactly what it says.
Who melatonin is licensed for in the UK
- Adults over 55 with persistent insomnia: prolonged-release melatonin (Circadin) is licensed for up to 13 weeks — natural melatonin production declines with age, so topping it up makes physiological sense in this group;
- Children and adolescents with certain conditions, such as autism or ADHD with severe sleep-onset problems — initiated by specialists;
- Jet lag: short courses can be prescribed for adults for eastward travel across multiple time zones.
Melatonin vs zopiclone — different tools
They’re often mentioned together but do different jobs. Zopiclone is a true sedative: potent for severe short-term insomnia, with meaningful tolerance and dependence risks, strictly limited to 2–4 weeks. Melatonin is gentler: it nudges the body clock rather than forcing sleep, has no established dependence problem, but won’t rescue a night the way a sedative does. Neither treats the causes of chronic insomnia — for that, CBT-i remains first-line (see alternatives to zopiclone).
A word on buying melatonin “gummies” online
Importing melatonin bought from overseas websites sits in a legal grey area and carries the same dose-accuracy problem US testing keeps finding — particularly concerning with children’s gummies, where accidental over-consumption is easy. If you think melatonin might genuinely suit you (or your child), the right route is a conversation with your GP — and our guide to talking to your GP about sleep can help you make the case clearly.
Frequently asked questions
Can I buy melatonin over the counter in the UK?
No — melatonin is classified as a medicine in the UK and requires a prescription. This also guarantees pharmaceutical manufacturing standards, unlike supplement-grade products sold abroad.
Who can be prescribed melatonin in the UK?
Mainly adults over 55 with persistent insomnia (prolonged-release melatonin, up to 13 weeks), children with certain conditions such as autism or ADHD under specialist care, and adults with jet lag for short courses.
Is melatonin safer than zopiclone?
It’s gentler — no established dependence problem and milder side effects — but it’s also less potent. They do different jobs: melatonin nudges the body clock, zopiclone sedates. Neither fixes chronic insomnia’s causes.
Are melatonin gummies from foreign websites safe?
They carry real dose-accuracy risks — independent testing has repeatedly found supplement melatonin containing much more or less than labelled — and importing them sits in a legal grey area. Talk to your GP instead.
Questions about your sleep or your medicines? Speak to one of our pharmacists — advice is free and confidential. If you already have a prescription, you can nominate our pharmacy to dispense and deliver it.
This article is general health information based on NHS and BNF guidance. It is not medical advice, and it is not an advertisement for a prescription-only medicine. Zopiclone is available only on prescription in the UK and cannot be purchased from this website. Always follow your prescriber’s instructions and read the patient information leaflet. If you need urgent help call NHS 111; in an emergency call 999. [Clinical review placeholder — reviewed by NAME, Superintendent Pharmacist, GPhC reg. NUMBER, on DATE.]