BRAND NAMES
 MECHANISM OF ACTION
Melatonin is a naturally occurring hormone produced by the pineal gland and is structurally related to serotonin. Physiologically, melatonin secretion increases soon after the onset of darkness, peaks at 2-4 am and diminishes during the second half of the night. Melatonin is associated with the control of circadian rhythms and entrainment to the light-dark cycle. It is also associated with a hypnotic effect and increased propensity for sleep.
The activity of melatonin at the MT1, MT2 and MT3 receptors is believed to contribute to its sleep-promoting properties, as these receptors (mainly MT1 and MT2) are involved in the regulation of circadian rhythms and sleep regulation.
Short-term treatment of primary insomnia characterised by poor quality of sleep in patients who are aged 55 or over.
The recommended dose is 2 mg once daily, 1-2 hours before bedtime and after food. This dosage may be continued for up to thirteen weeks.
Hypersensitivity to the active substance or to any of the excipients
 WARNINGS AND PRECAUTIONS
Use with caution if the effects of drowsiness are likely to be associated with a risk to safety
 PREGNANCY AND LACTATION
- Use in pregnant women and by women intending to become pregnant is not recommended
- Breast-feeding is not recommended in women under treatment with melatonin.
 SIDE EFFECTS
Side effects are not common. However, the following side effects are seen in between 1 and 10 patients in 1,000: irritability, nervousness, restlessness, insomnia, abnormal dreams, anxiety, migraine, lethargy (lack of energy), psychomotor hyperactivity (restlessness with increased activity), dizziness, somnolence, hypertension, abdominal pain, dyspepsia (heartburn), mouth ulcers, dry mouth, hyperbilirubinaemia (high blood levels of bilirubin, a breakdown product of red blood cells, which can cause yellowing of the skin and eyes), dermatitis (skin inflammation), night sweats, pruritus, rash, dry skin, pain in the extremities, symptoms of the menopause, asthenia, chest pain, glycosuria, proteinuria (protein in the urine), abnormal liver function tests and increased weight.
 RELATED LINKS
|Sedatives / Hypnotics / Anxiolytics|
|Benzodiazepines||Benzodiazepines (Anxiolytics)||Alprazolam (Xanax) • Bromazepam (Lexotan, Lexotanil) • Chlordiazepoxide (Librium) • Clobazam (Frisium) • Clorazepate (Tranxene) • Clotiazepam (Rizen, Tienor) • Delorazepam (EN) • Diazepam (Valium) • Etizolam (Depas) • Ketazolam • Lorazepam (Ativan, Control, Lorans, Tavor, Temesta) • Lormetazepam (Noctamid) • Nordazepam (Nordaz) • Oxazepam (Serepax) • Prazepam (Demetrin, Lysanxia)|
|Benzodiazepines (Hypnotics)||Brotizolam (Lendormin, Bondormin, Dormex, Sintonal, Noctilan) • Clobazam (Frisium) • Estazolam (Esilgan, ProSom) • Etizolam (Depas, Pasaden, Etilaam, Etizest) • Flunitrazepam (Rohypnol) • Flurazepam (Dalmadorm, Dalmane, Felison, Flunox, Valdorm) • Ketazolam (Anseren, Anxon) • Lorazepam (Ativan, Control, Lorans, Tavor, Temesta) • Lormetazepam (Loramet, Minias, Noctamid, Pronoctan, Evamyl) • Midazolam (Dormicum, Hypnovel) • Nitrazepam (Mogadon, Nitrados, Numbon, Radedorm, Alodorm) • Nordazepam (Madar, Nordaz, Stilny, Tranxilium N) • Temazepam (Normison, Restoril, Tenox, Temaze) • Triazolam (Halcion, Hypam, Rilamir)|
|Non-Benzodiazepine Hypnotics||Eszopiclone (Lunesta) • Zolpidem (Ambien, Stilnox, Hypnogen, Sanval, Stilnoct, Zoldem, Zolsana) • Zopiclone (Imovane, Zimovane)|
|Melatonin agonists||Melatonin (Circadin) • Ramelteon (Rozerem)|
|Orexin agonists||Suvorexant (Belsomra)|