Čo je Melatonin?
Melatonin is a hormone naturally produced by the pineal gland in the brain in response to darkness. It plays a central role in regulating the body’s circadian rhythm — the internal clock that governs sleep and wakefulness cycles. As a medicine, Melatonin is available in both prescription-grade and, in some EU countries, over-the-counter formulations, and is used to support sleep onset and treat circadian rhythm disturbances.
Ako funguje Melatonin?
Melatonin acts on MT1 and MT2 melatonin receptors in the brain’s suprachiasmatic nucleus (SCN), the master circadian pacemaker. Through these receptors, exogenous melatonin:
- Signals the onset of biological night: Melatonin administration during the biological daytime or in the early evening can advance the internal clock (shift it earlier), helping people who struggle to fall asleep at a conventional time.
- Reduces sleep onset latency: EMA-approved Circadin (prolonged-release melatonin 2 mg) is specifically designed to release melatonin gradually over the night, mimicking the natural nocturnal melatonin profile more closely than immediate-release formulations.
- Improves sleep quality: Clinical trial data submitted to the EMA for Circadin’s approval demonstrated improvements in sleep quality and morning alertness compared to placebo in adults aged 55 and over with primary insomnia.
- Counteracts jet lag: Melatonin taken at the destination bedtime helps realign the body clock more quickly with the new time zone, reducing subjective jet lag severity and duration.
Unlike sedative hypnotics (benzodiazepines, Z-drugs), Melatonin does not act on GABA receptors and does not cause pharmacological sedation or respiratory depression.
Pre koho je určený/á Melatonin?
EMA-approved indications:
- Circadin (2 mg prolonged-release): Short-term treatment (up to 13 weeks) of primary insomnia characterised by poor sleep quality in adults aged 55 and over.
- Slenyto (paediatric prolonged-release): Treatment of sleep disturbance in children and adolescents aged 2–18 years with autism spectrum disorder (ASD) or Smith-Magenis syndrome.
Clinical use beyond approved indications includes:
- Jet lag in adults (widely accepted clinical use in Europe)
- Circadian rhythm sleep-wake disorders (e.g., delayed sleep phase syndrome, shift work disorder)
- Sleep support in blind individuals with non-24-hour sleep-wake disorder
Prescription status in Europe varies by member state:
- Prescription required (examples): Germany, France, Sweden, Denmark — melatonin at therapeutic doses (typically ≥1 mg) is classified as a prescription medicine.
- Available over the counter (examples): Netherlands, Ireland, Czech Republic — melatonin supplements are sold without a prescription, sometimes at lower doses.
- Ambiguous or category-dependent: Several EU countries have varying classifications depending on dose and formulation.
Always verify the regulatory status in your country of residence.
Dávkovanie
Dosage varies significantly depending on the indication, formulation, and applicable regulations in the patient’s country.
| Indication | Typical Dose | Timing | Duration |
|---|---|---|---|
| Primary insomnia (Circadin — adults 55+) | 2 mg prolonged-release | 1–2 hours before bedtime | Up to 13 weeks |
| Jet lag | 0.5–5 mg immediate-release | At destination bedtime for first 2–5 nights | 2–5 days |
| Delayed sleep phase disorder | 0.5–3 mg | 1–2 hours before desired sleep time | Weeks to months (under supervision) |
| Paediatric (Slenyto) | 1–5 mg | 30 minutes before bedtime | As directed by prescribing doctor |
Higher doses are not necessarily more effective. A lower dose (0.5–1 mg) may be adequate for some individuals and is associated with fewer side effects. The appropriate dose should be determined by a qualified healthcare professional.
Melatonin is taken orally, typically as a tablet or capsule. Prolonged-release tablets (such as Circadin) should be swallowed whole and not crushed or chewed.
Vedľajšie účinky
Melatonin has a well-established safety profile at approved doses. Side effects are generally mild and transient.
Common side effects (may affect up to 1 in 10 people)
- Headache
- Dizziness
- Nausea
- Drowsiness (may persist into the next day at higher doses)
- Irritability or mood changes
Less common side effects
- Daytime fatigue: Particularly if taken too close to waking time or at high doses.
- Vivid dreams or nightmares: Some users report changes in dream quality or intensity.
- Elevated prolactin levels: Melatonin may influence hormonal axes; this is generally clinically insignificant at approved doses.
- Blood pressure changes: Melatonin may slightly reduce blood pressure. Monitor in patients on antihypertensive medicines.
Considerations for specific populations
- Older adults: May experience increased sensitivity; the 2 mg Circadin dose is approved specifically for this group.
- Pregnant or breastfeeding women: Limited safety data available. Use is generally not recommended without direct medical supervision.
- Children: Only age-appropriate formulations (Slenyto) under medical supervision should be used. Self-administration of adult supplements in children is not recommended due to potential effects on hormonal development.
Melatonin vs alternatívy
| Approach | Mechanism | Available Without Rx? | Key Consideration |
|---|---|---|---|
| Melatonin (Circadin 2 mg) | Circadian rhythm regulation via MT1/MT2 receptors | No (in most EU states) | Non-sedating; approved for 55+; short-term use |
| Benzodiazepines (e.g., temazepam) | GABA-A receptor potentiation | No | Risk of dependence, tolerance, and next-day impairment |
| Z-drugs (e.g., zolpidem, zopiclone) | GABA-A receptor subtype agonism | No | Dependence risk; rebound insomnia; not suitable for all |
| Antihistamines (e.g., diphenhydramine) | H1 receptor antagonism | Yes (many countries) | Sedation by antihistamine mechanism; tolerance develops rapidly |
| Sleep hygiene interventions | Behavioural / circadian | N/A | First-line recommendation by EMA and clinical guidelines |
Key distinction: Melatonin does not cause pharmacological dependence or withdrawal effects, which differentiates it from benzodiazepines and Z-drugs. Clinical guidelines in Europe (including NICE and equivalent national guidelines) recommend Melatonin as a preferred option for primary insomnia in adults aged 55 and over, ahead of benzodiazepines and Z-drugs.
Ako získať Melatonin online v Európe
Where Melatonin requires a prescription in your country, Prescrivia operates as a technology intermediary connecting patients with independent EU-registered doctors who can conduct confidential online health assessments.
Postup je nasledovný:
- Vyplňte zdravotný dotazník: Answer structured health questions covering your sleep history, current medications, and relevant medical history. This assessment is reviewed by an independent doctor.
- Posúdenie lekárom: An independent EU-registered doctor reviews your assessment. If prescription Melatonin is clinically appropriate for your circumstances, they may issue a prescription. If not, the doctor will explain why.
- Predpis a vybavenie: If a prescription is issued, it is sent to a licensed EU pharmacy partner, which dispenses and ships the medicine directly to you.
Important: Prescrivia does not guarantee that a prescription will be issued. All prescribing decisions are made independently by qualified medical professionals based on your individual clinical circumstances and the prescription regulations in your member state.
Dôležité bezpečnostné informácie
Exercise caution with Melatonin if you:
- Are pregnant or breastfeeding (limited safety data)
- Have autoimmune conditions (Melatonin may have immunomodulatory effects)
- Have hepatic impairment (Melatonin is metabolised by the liver via CYP1A2)
- Are taking fluvoxamine or other strong CYP1A2 inhibitors (markedly increase Melatonin plasma levels)
Informujte svojho lekára pred začatím užívania Melatonin ak máte:
- Take warfarin or other anticoagulants (Melatonin may potentiate anticoagulant effects)
- Take medicines for hypertension
- Have a seizure disorder
- Have a history of depression or other mood disorders
- Are taking other sedative medicines
Liekové interakcie: Melatonin is metabolised primarily by CYP1A2. Smoking and caffeine induce CYP1A2, reducing Melatonin plasma levels. Fluvoxamine and other CYP1A2 inhibitors dramatically increase Melatonin exposure. Alcohol should be avoided when taking Melatonin as it can impair the sleep quality benefit and increase sedation risk.
Driving: Melatonin may cause drowsiness. Do not drive or operate heavy machinery for several hours after taking Melatonin until you know how it affects you.
Zdroje
Lekárske informácie na tejto stránke vychádzajú z nasledujúcich zdrojov:
- European Medicines Agency (EMA). Circadin (melatonin) — Summary of Product Characteristics. Available at: ema.europa.eu
- European Medicines Agency (EMA). Assessment report: Circadin. EMEA/H/C/000695.
- European Medicines Agency (EMA). Slenyto (melatonin) — Summary of Product Characteristics. Available at: ema.europa.eu
- Ferracioli-Oda E, et al. Meta-analysis: melatonin for the treatment of primary sleep disorders. PLoS One. 2013;8(5):e63773.
- World Health Organization (WHO). Mental health: sleep disorders. who.int
Tento obsah je pravidelne prehodnocovaný s ohľadom na aktualizované klinické usmernenia. Je poskytovaný len na informačné účely a nepredstavuje lekárske poradenstvo. Vždy sa poraďte s kvalifikovaným zdravotníckym pracovníkom o rade týkajúcej sa Vašich individuálnych zdravotných okolností.
Frequently asked questions
- Na čo sa používa Melatonin?
- Melatonin is used to help reset the body's internal clock and improve sleep onset. EMA-approved prescription formulations (e.g., Circadin 2 mg) are indicated for short-term treatment of primary insomnia characterised by poor sleep quality in adults aged 55 and over. Melatonin is also used for jet lag and circadian rhythm sleep disorders.
- Is Melatonin available without a prescription in Europe?
- Melatonin's regulatory status varies significantly across EU member states. In some countries (e.g., the Netherlands, Ireland), melatonin supplements are available over the counter. In others (e.g., Germany, France, Sweden), melatonin at therapeutic doses is classified as a prescription-only medicine. Always check the regulations in your country of residence.
- What dose of Melatonin is effective for sleep?
- The EMA-approved Circadin formulation contains 2 mg of prolonged-release melatonin. For jet lag, doses of 0.5–5 mg taken at the destination bedtime for 2–5 days are commonly used. Higher doses do not necessarily produce better outcomes and may increase the risk of side effects such as daytime drowsiness.
- Môžem získať Melatonin online v Európe?
- Prístup k prípravku môžete získať prostredníctvom online sprostredkovateľských platforiem, ktoré Vás spoja s nezávislými lekármi registrovanými v EÚ. Po vyplnení dôverného zdravotného dotazníka lekár posúdi, či je liek pre Vás klinicky vhodný.
- Je bezpečné for long-term use?
- The EMA-approved Circadin formulation is indicated for short-term use (up to 13 weeks). Long-term data on efficacy and safety beyond this period is limited. Melatonin does not cause physical dependence, but it should not replace evaluation of underlying causes of sleep disturbance.
- Can children take Melatonin?
- Slenyto (a prolonged-release melatonin formulation) is EMA-approved for children and adolescents aged 2–18 with autism spectrum disorder or Smith-Magenis syndrome who have sleep disturbance. Melatonin should not be given to children without medical supervision due to potential hormonal effects at critical developmental stages.
Prescrivia je iba sprostredkovateľská platforma. Neposkytujeme lekárske služby, nepredpisujeme liečbu ani nevydávame lieky. Všetky lekárske rozhodnutia robia nezávislí lekári registrovaní v EÚ. Všetky lieky vydávajú licencované lekárne v EÚ. Táto platforma uľahčuje spojenie medzi pacientmi a poskytovateľmi zdravotnej starostlivosti.