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Brand name: Circadin

Circadin is a brand of tablets containing the active ingredient melatonin. It is available only with a doctor’s prescription.

Circadin is used to improve sleep quality and morning alertness in people aged 55 years or over who don't sleep well. Your body produces the hormone melatonin, which controls your 24-hour body clock. This is called the circadian rhythm. The melatonin in Circadin, which is not from plants or animals, helps you to go to sleep.

Circadin tablets are swallowed whole with a full glass of water. The usual way of taking Circadin is one tablet after food, 1 to 2 hours before you go to bed.

You should seek medical advice in relation to medicines and use only as directed by a healthcare professional. Always read the label. If symptoms persist see your healthcare professional. healthdirect medicines information is not intended for use in an emergency. If you are suffering an acute illness, overdose, or emergency condition, call triple zero (000) and ask for an ambulance.

Reasonable care has been taken to provide accurate information at the time of creation. This information is not intended to substitute medical advice, diagnosis or treatment and should not be exclusively relied on to manage or diagnose a medical condition. Please refer to our terms and conditions.

Active ingredient in this medicine: melatonin

Information for medicine and pack size:
Circadin 2 mg modified release tablet, 21

Consumer Medicine Information leaflet:

This leaflet may also be found inside the medicine package. It contains information on side effects, age restrictions and other useful data.

Read leaflet

What this medicine is for

Monotherapy for the short term treatment of primary insomnia characterized by poor quality of sleep in patients who are aged 55 or over.

Table of characteristics
Table of characteristics
Active ingredient
Visual appearance White to off-white, round, biconvex tablets
Dosage Form Tablet, modified release
Route of administration Oral
Medicine schedule
21 tablets: Prescription Only Medicine, or Prescription Animal Remedy
30 tablets: Prescription Only Medicine, or Prescription Animal Remedy
7 tablets: Prescription Only Medicine, or Prescription Animal Remedy

There is one type of pack available.

Pack type 1
Pack type 1
Type Blister Pack
Storage temperature Store below 25 degrees Celsius
Storage conditions Protect from Light
Life time 5 Years
We were unable to verify that this medicine is available on the PBS (Pharmaceutical Benefits Scheme). Please consult your pharmacist if you need further information

The PBS provides a list of government subsidised medicines available to be dispensed to patients. Further information can be found on the Pharmaceutical Benefits Scheme website.

Go to PBS site

Is this medication banned in sport?

Check if you can use your medicine whilst playing sport. Search the Australian Sports Anti-Doping Authority (ASADA) database that provides information about the prohibited status of specific medications and/or the active ingredient based on the current World Anti-Doping Agency (WADA) Prohibited List.

Go to ASADA site

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Circadin (melatonin) is used to improve sleep quality and morning alertness in people over 55 years, with primary insomnia. It is a short term treatment.

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Insomnia | myVMC

Insomnia is defined as unsatisfactory sleep that affects daytime functions

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Primary insomnia (idiopathic insomnia) | myVMC

Primary insomnia refers to sleep difficulties that affect daytime functioning and are not associated with any other medical condition or substance use.

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