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Melatonin 3 mg, film-coated tablets – patient leaflet, side effects, dosage

Last updated: · Text from the MHRA, as of · About this document

Medicine status: Prescription only (POM) Details

Medicine strength:
3 mg
Contains active substance:
ATC code:
Similar medicines:

Patient leaflet - Melatonin 3 mg film-coated tablets

1. What Melatonin 3 mg tablets are and what it is used for

Melatonin 3 mg tablets contain the active substance melatonin. Melatonin is a hormone produced naturally in the body. This hormone helps regulate the body’s day- and night rhythm.

Melatonin 3 mg tablets can be used for:

  • Short-term treatment of jet-lag, in adults only. Jet-lag

    refers to the symptoms caused by the time difference when travelling across several time zones.

How Melatonin 3 mg tablets work

Melatonin is a hormone produced by the body that synchronises the body’s biological day-and-night rhythm. The biological rhythm can be disturbed by travelling across time zones. This is known as jet-lag.

You must talk to a doctor if you do not feel better or if you feel worse when taking this medicine.

2. What you need to know before you take Melatonin 3 mg tablets

Do not take Melatonin 3 mg tablets

  • if you are allergic to melatonin or any of the other

    ingredients of this medicine (listed in section 6).

Warnings and precautions

Talk to your doctor or pharmacist before taking Melatonin 3 mg tablets

  • if you suffer from seizures. Melatonin may increase

    seizure frequency, for example in patients with epilepsy.

  • if you have an autoimmune disease (where the body is

    ‘attacked’ by its own immune system).

  • if you have diabetes or impaired glucose tolerance, as

    this medicine may increase the level of glucose in your blood. Please ensure that this medicine is taken at least 2 hours before a meal or at least 3 hours after a meal if you suffer from diabetes.

  • if you suffer from moderately to significantly impaired

    liver function or significantly impaired kidney function.

  • if you smoke. Smoking may reduce the effect of

    Melatonin 3 mg tablets as components of tobacco smoke can increase the breakdown of melatonin by the liver.

  • if you suffer from hypertension and are being treated for

    this. Melatonin 3 mg tablets may reverse the beneficial effects of blood pressure-lowering medicines.

  • This medicine can make you feel drowsy, you should

    be careful if the drowsiness affects you as it may impair your ability on tasks such as driving.

Children and adolescents

Do not give this medicine to children and adolescents between 0 and 18 years as its safety and effectiveness in the short-term treatment of jet-lag are unknown.

Other medicines and Melatonin 3 mg tablets

Tell your doctor or pharmacist if you are taking, have recently taken, or might take any other medicines.

  • Fluvoxamine (used for the treatment of depression and

    obsessive-compulsive disorder), as fluvoxamine may increase the effect of melatonin.

  • Imipramine (used for the treatment of depression), as

    both medicines taken together enhance feelings of drowsiness and can cause difficulty in performing tasks.

  • Thioridazine (used for the treatment of mental/mood

    disorders), as both medicines taken together enhance feelings of drowsiness and difficulty in performing tasks.

  • Psoralens (used for the treatment of skin disorders

    e.g. psoriasis), as psoralens may increase the effect of melatonin.

  • Cimetidine (used for the treatment of stomach problems

    such as ulcers), as cimetidine may increase the effect of melatonin.

  • Oestrogens (used in contraceptives or hormone

    replacement therapy), as oestrogens may increase the effect of melatonin.

  • Quinolones (used for the treatment of bacterial

    infections), as quinolones may increase the effect of melatonin.

  • Rifampicin (used for the treatment of bacterial

    infections), as rifampicin may decrease the effect of melatonin.

    • Carbamazepine (used in the treatment of epilepsy), as carbamazepine may decrease the effect of melatonin.
    • Warfarin and other blood-thinning medicines, e.g.

      dabigatran, rivaroxaban, apixaban, edoxaban, as melatonin may interfere with the effect of these medicines. It may be necessary to measure the time for the blood to clot, also known as an INR-test.

    • Benzodiazepines and non-benzodiazepine hypnotics

      (medicines used to induce sleep, e.g. midazolam, temazepam, and zaleplon, zolpidem, zopiclone), as melatonin may enhance the sedative effect of such medicines, and may enhance certain side effects of zolpidem (morning sleepiness, nausea, confusion).

    • Nifedipine and other calcium channel blocker medicines

      (used for the treatment of high blood pressure), as both medicines taken together may increase blood pressure.

    • Caffeine (stimulant), as melatonin interacts with caffeine.

Melatonin 3 mg tablets with food and alcohol

  • This medicine should not be taken with food

    (see section 3).

  • As alcohol can impair sleep and potentially worsen certain symptoms of jet-lag (e.g. headache, morning fatigue, impaired concentration) it is recommended that alcohol is not consumed while taking this medicine.
  • Consuming alcohol while taking this medicine may lead to increased drowsiness.

Pregnancy, breast-feeding and fertility

If you are pregnant or breast-feeding, think you may be pregnant, or are planning to have a baby, ask your doctor or pharmacist for advice before taking this medicine.

Pregnancy

Melatonin 3 mg tablets are not recommended if you are pregnant. Melatonin crosses the placenta and there is insufficient information on the risk this may pose to the unborn child. If you are a woman of childbearing potential, you have to use contraception.

Breast-feeding

Melatonin 3 mg tablets are not recommended if you are breast-feeding. Melatonin passes into human milk, and a risk to the breast-fed infant or child cannot be excluded.

Fertility

Melatonin 3 mg tablets are not recommended in women and men planning to have a baby, as there is insufficient information on the effects of melatonin on female and male fertility.

Driving and using machines

Melatonin 3 mg tablets may cause drowsiness and may decrease alertness for several hours after intake. Therefore, this medicine should not be taken prior to driving or using machines.

Melatonin 3 mg tablets contain sodium

This medicine contains less than 1 mmol sodium (23 mg) per film-coated tablet, that is to say essentially ‘sodium-free’.

3. How to take Melatonin 3 mg tablets

Always take this medicine exactly as described in this leaflet or as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.

The recommended dose for adults and elderly is 1 tablet daily for a maximum of 5 days. When the effect of Melatonin 3 mg tablets is inadequate, 2 tablets can be taken simultaneously the following evening. The dose that reduces symptoms sufficiently should be taken for the shortest period necessary.

The first dose should be taken on arrival at destination at your usual bed-time. Intake on the following days should also be at your usual bed-time. Tablet(s) should not be taken before 20:00 h or after 04:00 h.

Tablets should be swallowed whole with water or other liquid (e.g. milk, fruit juice). Food should not be consumed at least 2 hours before or at least 2 hours after intake of Melatonin 3 mg tablets. If you have impaired glucose tolerance or diabetes Melatonin 3 mg tablets should ideally not be taken until at least 3 hours after a meal.

You must talk to a doctor if you do not feel better or if you feel worse when taking this medicine.

If you take more Melatonin 3 mg tablets than you should

If you have taken more Melatonin 3 mg tablets than recommended and you do not feel well, please contact your doctor, hospital or pharmacy.

The most common symptoms of overdose are drowsiness, headache, dizziness, and nausea.

If you forget to take Melatonin 3 mg tablets

If you forget to take a tablet(s) at bedtime and wake during the night you may take the forgotten dose, but at no later than 04:00 h.

Do not take a double dose to make up for a missed dose.

I-7679-11 I-7679-11 If you stop taking Melatonin 3 mg tablets

If you stop taking this medicine, it will not have any harmful effects or withdrawal symptoms.

If you have any further questions on the use of this medicine, ask your doctor or pharmacist.

4. Possible side effects

Like all medicines, this medicine can cause side effects, although not everybody gets them.

Serious side effects

If you experience any of the following serious side effects, stop taking this medicine and contact your doctor immediately:

Uncommon side effects

(may affect up to 1 in 100 people)

  • Chest pain.

Rare side effects

(may affect up to 1 in 1,000 people)

  • Reduced number of white blood cells in the blood.
  • Reduced number of blood platelets, which increases the

    risk of bleeding or bruising.

  • Disorientation.
  • Fainting.
  • Visual impairment, including blurred vision.
  • Chest pain due to angina pectoris.
  • Feeling your heartbeat (‘pounding chest’).
  • Blood (red blood cells) in the urine.

Not known

(frequency cannot be estimated from available data)

  • Severe allergic reaction resulting in swelling of the

    tongue or lining of the mouth

Other side effects

If you experience any of the following other side effects, contact your doctor or pharmacist:

Uncommon side effects

(may affect up to 1 in 100 people)

  • Irritability, nervousness, restlessness, sleeplessness,

    abnormal dreams, nightmares, anxiety.

  • Migraine, headache, lethargy, drowsiness.
  • Restlessness associated with increased activity.
  • Dizziness.
  • High blood pressure.
  • Abdominal pain, upper abdominal pain, indigestion,

    mouth ulceration, dry mouth, nausea.

  • Changes in the composition of your blood that can

    cause yellowing of the skin and eyes.

  • Inflammation of the skin, night sweats, itching, rash, dry

    skin.

  • Pain in the extremities.
  • Excretion of glucose in the urine, excess protein in the

    urine.

  • Menopausal symptoms in women.
  • Feeling unwell.
  • Abnormal results in liver function tests.
  • Weight increase.

Rare side effects

(may affect up to 1 in 1,000 people)

  • Herpes zoster.
  • High levels of certain fat molecules (triglycerides) in the

    blood.

  • Low calcium or sodium levels in the blood.
  • Altered mood, aggression, crying, stress symptoms,

    early morning awakening, increased sex drive.

  • Depression.
  • Memory impairment, disturbance in attention, dreamy

    state, restless legs syndrome, ‘pins and needles’ sensation.

  • Watery eyes.
  • Vertigo (a feeling of dizziness or “spinning”), dizziness

    when standing or sitting, vertigo positional.

  • Hot flushes.
  • Acid reflux, gastrointestinal disorder, blistering in the

    mouth, tongue ulceration, stomach upset.

  • Vomiting, abnormal bowel sounds, wind, excess saliva,

    bad breath, abdominal discomfort, inflammation of the stomach lining.

  • Eczema, erythema, dermatitis of the hands, psoriasis,

    nail disorder.

  • Arthritis, muscle spasms, neck pain, night cramps.
  • Passing large volumes of urine, need to urinate at night.
  • Prolonged erection that might be painful, inflammation

    of the prostate gland.

  • Tiredness, pain, thirst.
  • Increased liver enzymes, abnormal levels of electrolytes

    in the blood.

Not known

(frequency cannot be estimated from available data)

  • Hypersensitivity reactions.
  • High blood glucose level.
  • Flow of milk from the breasts (also in men).

Reporting of side effects

If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. You or your relatives can also report side effects directly via the Yellow Card Scheme Website: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects you can help provide more information on the safety of this medicine.

5. How to store Melatonin 3 mg tablets

  • Keep this medicine out of the sight and reach of children.
  • Do not use this medicine after the expiry date which is stated on the outer carton and blister after EXP. The expiry date refers to the last day of that month.
  • This medicine does not require any special temperature storage conditions.
  • This medicine should be stored in the original packaging in order to protect from light.

Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away any medicines you no longer use. These measures will help protect the environment.

6. Contents of the pack and other information

What Melatonin 3 mg tablets contain

  • The active substance is melatonin.

    Each tablet contains 3 mg melatonin.

  • The other ingredients are:

    Tablet core: magnesium stearate, colloid silica anhydrous, maltodextrin, microcrystalline cellulose, croscarmellose sodium.

    Film-coating: hypromellose.

What Melatonin 3 mg tablets look like and contents of the pack

Round, biconvex, clear-coated, white to off-white tablet. Size 7.5 mm.

Blister pack containing 10, 20 or 30 film-coated tablets, in carton.

Not all pack sizes may be marketed.

Marketing Authorisation Holder and Manufacturer

Pharma Nord ApS

Tinglykke 4-6

6500 Vojens

Denmark

Local representative

Pharma Nord (UK) Ltd.,

Telford Court, Morpeth,

Northumberland,

NE61 2DB, UK

This medicinal product is authorised in the Member States of the European Economic Area and in the United Kingdom (Northern Ireland) under the following names:

Belgium Melatonine Pharma Nord 3 mg comprimés pélliculés / filmomhulde tabletten / Filmtabletten

Denmark Melatonin Pharma Nord

Estonia Melatoniin Pharma Nord 3 mg

õhukese polümeerikattega tabletid

Finland Melatonin Pharma Nord 3 mg, kalvopäällysteinen tabletti / filmdragerade tablett

Germany Melatonin Pharma Nord 3 mg

Filmtabletten

Hungary Melatonin Pharma Nord 3 mg filmtabletta

Ireland Melatonin Pharma Nord 3 mg film-coated tablets

Latvia Melatonin Pharma Nord 3 mg apvalkotās tabletes

Lithuania Melatoninas Pharma Nord 3 mg plėvele dengtos tabletės

Luxembourg Melatonine Pharma Nord 3 mg comprimés pélliculés / filmomhulde tabletten / Filmtabletten

Netherlands Melatonine Pharma Nord 3 mg filmomhulde tabletten

Norway Melatonin Pharma Nord

Poland Melatonina Pharma Nord 3 mg tabletki powlekane

Portugal Melatonina Pharma Nord 3 mg, comprimidos revestidos por película

Slovenia Melatonin Pharma Nord 3 mg filmsko obložene tablete

Spain Melatonite 3 mg

comprimidos recubiertos con película

Sweden Melatonin Pharma Nord 3 mg filmdragerade tabletter

United

Kingdom (NI)

Melatonin 3 mg, film-coated tablets

This leaflet was last revised in 04/2026.

About this document

Source: MHRA - Medicines and Healthcare products Regulatory Agency (products.mhra.gov.uk) · Marketing authorisation: PL 20243/0003

Last revision stated in the text: April 2026 · MHRA data as of 13 October 2026

Found a mistake? Tell us on the contact page.

The information on this site does not replace the advice of a doctor or pharmacist.

Facts about Melatonin 3 mg film-coated tablets

Prescription needed? Yes, prescription-only medicine (POM)
Active substance Melatonin
Strength 3 mg
Pharmaceutical form Oral tablet
How is it taken Oral
Excipients Magnesium stearate, Colloid silica, anhydrous, Maltodextrin, Microcrystalline cellulose, Croscarmellose sodium, Hypromellose
Pack sizes 30 tablet
Is it available? Listed as available (NHS Dictionary of Medicines and Devices – not a record of current supplies)
Shelf life 3 years
Storage This medicinal product does not require any special temperature storage conditions. Store in the original package in order to protect from light.
Drug group (ATC) Psycholeptics, melatonin receptor agonists
  1. N Nervous system drugs
    1. N05 Psycholeptics
      1. N05C Hypnotics and sedatives
        1. N05CH Melatonin receptor agonists, hypnotics and sedatives
          1. N05CH01 melatonin
Marketing authorisation PL 20243/0003 (first authorised 11 September 2019)
Marketing authorisation holder Pharma Nord ApS
Codes GTIN 5707390040023 · BNF 04010100

Sources: the MHRA product information (products.mhra.gov.uk) and the NHS Dictionary of Medicines and Devices (dm+d), release 10.1.0 of 12 October 2026, NHS Business Services Authority. Contains public sector information licensed under the Open Government Licence v3.0.