Melatonin in Australia: Rules, Uses and What It Can't Do

If you've looked for melatonin in Australia, you'll have noticed it isn't on the supermarket shelf the way it is in the United States. That's deliberate: here it's regulated as a medicine, and who can buy it depends on their age and what they need it for. This guide covers what melatonin is, the current rules on getting it, what it's good for and what it isn't, how to time it, and how it fits with jet lag.

The short answer: melatonin is a hormone your body makes in the evening to signal that it's time to sleep. In Australia it's a prescription medicine for most people. The exception is adults aged 55 and over, who can buy a 2 mg modified-release product from a pharmacist for short-term insomnia without a script. It works best as a body-clock tool, for jet lag, shift work and sleep phase problems, and less well as a general sleeping pill. Talk to a pharmacist or GP about dose and timing. This guide is general information, not medical advice.

What melatonin is

Melatonin is a hormone made by the pineal gland in your brain. Its levels follow a 24-hour cycle controlled by your body clock: low during the day, and around ten times higher at night (source). Your blood melatonin starts to rise about two hours before your usual sleep time, which helps set up the conditions for sleep and nudges your core body temperature down slightly (source).

Light exposure is the main thing that sets this rhythm, which is why melatonin and light tend to be discussed together in sleep advice. For the wider picture of how your clock works, see your body clock explained.

The rules in Australia

Melatonin is a scheduled medicine here, not a supplement. The rules as we understand them in October 2026 are:

Who	What you can get	How
Adults 55 and over	Modified-release tablets of 2 mg or less, for short-term primary insomnia, in packs of up to 30	From a pharmacist without a prescription (Pharmacist Only medicine)
Adults under 55	Melatonin tablets	Prescription from a doctor
Children	Melatonin, usually for sleep problems linked to autism, ADHD or developmental conditions when other approaches haven't worked	Prescription only, and not under 2 years of age

A few details worth knowing:

• "Short-term" means short. The Pharmaceutical Society of Australia's guidance for pharmacists defines it as up to three weeks before referring the person to a doctor (source).
• Pharmacists have to check it suits you. Expect questions about your sleep, other medicines and health conditions. That's a legal requirement, not a sales pitch.
• There's a jet lag pathway on paper. The same scheduling allows pharmacists to supply immediate-release melatonin of 5 mg or less to adults 18 and over for jet lag, in small packs. When the PSA wrote about it, no commercial product was on shelves, so in practice this has meant a compounded preparation or a prescription. Ask your pharmacist what's currently available.
• Online gummies are a different story. Products bought from overseas websites aren't regulated by the TGA. The Sleep Health Foundation notes that online melatonin products have been shown to contain varying amounts of melatonin and other contaminants, with gummies the most variable (source).

Scheduling rules do change, so treat this as a snapshot and confirm with your pharmacist.

What melatonin is good for, and what it isn't

Melatonin is best thought of as a timing signal rather than a sedative. healthdirect describes it as usually used for short-term sleep problems or to reset your body clock after shift work or jet lag.

Where it has a clear role:

• Jet lag, to help your clock catch up with the new time zone. See jet lag tips for Australians.
• Delayed sleep phase, where your clock runs late and you can't fall asleep until the small hours. Melatonin at night is often combined with bright light in the morning.
• Shift work, to help sleep at an unusual time. See silent alarms for shift workers.
• Older adults with insomnia, which is what the pharmacist-supply product is approved for.

Where it's weaker:

• Insomnia driven by stress, worry or habits. The Sleep Health Foundation points out that melatonin isn't designed to help all sleep difficulties. If your clock is fine but you lie awake thinking, the fix is usually behavioural. See insomnia: what actually helps.
• Waking at 3am. Melatonin taken at bedtime does little for early waking. See why do I keep waking up at 3am?
• Long-term nightly use. The Sleep Health Foundation's view is that long-term use is only appropriate if prescribed for a significant underlying sleep disorder.

Dose and timing

• Less is often enough. The Sleep Health Foundation notes that daily doses from 0.5 mg to 5 mg appear similarly effective, with sleep onset possibly a bit quicker at the higher end. The common Australian prescription product is 2 mg slow-release.
• Take it about an hour before bed for sleep onset, though some people feel sleepy within 20 minutes.
• For body-clock shifting, timing matters more than dose. Taking it earlier in the evening pulls your clock earlier. This is where a pharmacist or GP earns their keep.
• Don't drive or operate machinery after taking it.
• Side effects are uncommon but can include daytime sleepiness, headache, nausea and dizziness. If you feel groggy the next morning, see why do I feel groggy after waking up?

Melatonin and children

This one gets a section of its own because the imported-gummy habit is common. In Australia, all melatonin for children is prescription only, and it's mainly used for sleep problems linked to autism, ADHD or developmental conditions when behavioural strategies haven't been enough. Those strategies still need to continue alongside it. The Sleep Health Foundation notes that the long-term safety of melatonin in typically developing children isn't yet known, and it shouldn't be given to children under two. If your child's sleep is a struggle, start with your GP.

When to see your GP

See your GP if your sleep problem has lasted more than a few weeks, if you're under 55 and want to try melatonin, if you've used a pharmacist-supplied product for three weeks without improvement, or if you snore loudly, wake gasping or feel exhausted most days despite enough time in bed. Also go before giving melatonin to a child, and if you take other medicines, since melatonin can interact with some of them.

Where the Sovune Nudge fits

We make the Sovune Nudge, a vibrating alarm wristband, so we're not neutral. Melatonin is about the start of the night. The part it doesn't solve is getting up at a fixed time, which is what actually anchors your body clock. The Nudge helps there:

• Each alarm vibrates for a full minute, building through three intensity levels from a gentle tap, which helps on mornings when melatonin leaves you a little heavy.
• Three separate alarms, useful if you're shifting your sleep time gradually or working rotating shifts.
• No light or sound in the room, so it doesn't disturb a partner, and there's no glowing screen at bedtime: no app, no phone, no Bluetooth.
• Shows the time when you press the button, which means your phone can stay out of the bedroom entirely.

It comes with a 30-day money-back guarantee.

Quick answers

Can you buy melatonin over the counter in Australia? Only if you're 55 or over, and only a 2 mg modified-release product from a pharmacist for short-term insomnia. Everyone else needs a prescription.

How long before bed should I take melatonin? About an hour before bed for sleep onset. For shifting your body clock, the timing is different, so ask a pharmacist or GP.

Is melatonin safe to take every night? Short-term use is generally considered safe for adults. Long-term nightly use should only happen under a doctor's care for a diagnosed sleep disorder.

Does melatonin work for jet lag? It can help reset your clock after overseas travel, and works best alongside getting daylight at the right times in the new time zone.

For every type of silent alarm compared, see our complete guide to vibrating alarms in Australia.

See the Sovune Nudge →