Melatonin tablets for insomnia
Adaflex, Circadin
Revisado por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización: 30 de agosto de 2023
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Melatonin is useful in helping to promote sleep in people over the age of 55 years who have difficulty sleeping. It also helps to promote sleep in children with learning difficulties such as Autism Spectrum Disorder (ASD) and ADHD.
Take one 2 mg tablet 1-2 hours before bedtime, with a snack.
Melatonin will make you feel sleepy, so do not drive and do not use tools or machines until this effect has worn off.
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About melatonin
Tipo de medicamento | Hipnótico (pastilla para dormir) |
Utilizado para | Mal sueño |
También llamado | Adaflex®; Ceyesto®; Circadin®; Civasta®; Slenyto®; Syncrodin® |
Disponible como | Modified-release tablets, tablets, capsules and oral liquid medicine |
Poor sleep can mean that you have difficulty getting to sleep, or that you wake up for long periods during the night, or that you wake early, or that you do not feel refreshed in the mornings.
Insomnia is a fairly common condition, but it does not usually last for long. Melatonin is a hormone which occurs naturally in the body and is associated with the control of the body's sleep pattern. As we grow older the amount of naturally occurring melatonin in the body reduces. Taking melatonin adds to the body's natural supply and helps to promote and improve the quality of sleep.
Circadin® and Civasta® tablets are prescribed for people over the age of 55 years who have insomnia, or difficulty sleeping.
Slenyto® tablets are prescribed for poor sleep in children between the ages of 2 years and 18 years with Autism Spectrum Disorder (ASD) or Smith-Magenis syndrome.
Adaflex® and Ceyesto® tablets are prescribed for poor sleep in children aged 6 to 17 years with ADHD. They can also be prescribed for adults who experience jet lag.
Syncrodin® tablets are prescribed for adults who experience jet lag.
Sometimes a doctor may prescribe melatonin for other groups of people with sleeping problems. If this is the case for you, the way you take melatonin and your dose may be different from the information in this leaflet. Follow your doctor's instructions carefully and ask your doctor or pharmacist if you are unsure of anything.
Before taking melatonin
Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start taking melatonin it is important that your doctor or pharmacist knows:
Si tiene algún problema con el funcionamiento del hígado o de los riñones.
If you have an autoimmune disease - a condition in which the body is attacked by its own overactive immune system. It includes conditions such as rheumatoid arthritis, multiple sclerosis, and lupus.
Si está tomando otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que pueda adquirirse sin receta, así como medicamentos a base de plantas y complementarios.
Si alguna vez ha tenido una reacción alérgica a un medicamento.
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How to take melatonin
Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about melatonin and will provide you with a full list of the side-effects which you may experience from taking it.
Take melatonin exactly as your doctor tells you to. For adults the dose is usually one 2 mg tablet daily, taken 1-2 hours before bedtime. For children with ASD the usual starting dose is 2 mg taken 30 minutes to one hour before bedtime. Your child's doctor may increase the dose slowly to get a better response.
Take the tablet with a snack or after eating some food. This will help the medicine to work later into the night. Swallow the tablet whole - do not break or crush the tablet because it is designed to release melatonin slowly over a few hours.
If you forget to take a tablet at the usual time but you remember before you go to sleep, take it when you remember. If you do not remember until the following day, just take the next dose as usual. Do not take two doses together to make up for a forgotten dose.
Aproveche al máximo su tratamiento
Do not take melatonin for longer than your doctor advises. It can be prescribed for up to 13 weeks for adults over 55.
Do not drink alcohol while you are taking melatonin because it will reduce the medicine's effectiveness in helping you to sleep.
Try to keep your regular appointments with your doctor. This is so your progress can be monitored.
There are some general recommendations that may help promote good sleep. Try to reduce the amount of caffeine you drink, especially in the afternoon and evening. Try to avoid eating heavy meals or drinking alcohol before bedtime. Exercise early in the day, rather than in the evening.
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Can melatonin cause problems?
Along with their useful effects, most medicines can cause unwanted side-effects but not everyone experiences them. The table below contains some of the side-effects associated with melatonin. Children may be more likely than adults to experience these side-effects. You will find a full list in the manufacturer's information leaflet supplied with your medicine. The unwanted effects often improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following continue or become troublesome.
Melatonin side-effects (these affect fewer than 1 in 10 people) | ¿Qué puedo hacer si me ocurre esto? |
Sensación de cansancio o sueño | Do not drive and do not use tools or machines until these effects have worn off |
Dolor de cabeza | Bebe mucha agua y pide a un farmacéutico que te recomiende un analgésico adecuado. Si los dolores de cabeza persisten, informe a su médico. |
Indigestión, náuseas, dolor de estómago | Coma alimentos sencillos: evite las comidas ricas o picantes. |
Feeling irritable or restless, mood swings, dry mouth, abnormal dreams, night sweats, dry or itchy skin, pains in the arms or legs | Si alguno de ellos le resulta molesto, hable con su médico |
If you experience any other symptoms which you think may be due to the tablets, speak with your doctor or pharmacist for further advice. Children with ASD may be more likely to experience mood swings, irritability or aggression when taking melatonin.
How to store melatonin
Mantenga todos los medicamentos fuera del alcance y de la vista de los niños.
Almacenar en un lugar fresco y seco, lejos del calor y la luz directos.
Información importante sobre todos los medicamentos
Información importante sobre todos los medicamentos
No tome nunca más de la dosis prescrita. Si sospecha que usted u otra persona ha tomado una sobredosis de este medicamento, acuda inmediatamente al servicio de urgencias de su hospital. Llévese el envase, aunque esté vacío.
Este medicamento es para usted. Nunca se lo dé a otras personas aunque su enfermedad parezca ser la misma que la suya.
Si va a someterse a una operación o a un tratamiento dental, comunique siempre a la persona que lleve a cabo el tratamiento qué medicamentos está tomando.
Si compra algún medicamento, compruebe con un farmacéutico que es seguro tomarlo con sus otros medicamentos.
No guarde medicamentos caducados o que no desee. Llévelos a su farmacia local, que se encargará de eliminarlos por usted.
Si tiene cualquier duda sobre este medicamento pregunte a su farmacéutico.
Informar de los efectos secundarios de un medicamento o vacuna
Si experimenta efectos secundarios, puede notificarlos en línea a través del sitio web de la Tarjeta Amarilla.
Lecturas complementarias y referencias
- Manufacturer's PIL, Circadin® 2 mg prolonged-release Tablets; Flynn Pharma Ltd, The electronic Medicines Compendium. Dated October 2021.
- Manufacturer's PIL, Slenyto® 1 mg and 5 mg prolonged release tablets; Flynn Pharma Ltd, The electronic Medicines Compendium. Dated October 2021.
- Medicamentos BNF completa 89ª edición; Asociación Médica Británica y Real Sociedad Farmacéutica de Gran Bretaña, Londres.
Historia del artículo
La información de esta página ha sido redactada y revisada por médicos cualificados.
Fecha de la próxima revisión: 29 de agosto de 2026
30 ago 2023 | Última versión

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