Sen para el estreñimiento
Senokot
Revisado por pares por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 12 Nov 2024
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Senna can take 8-12 hours to have an effect. It is best taken in the evening.
If you are still constipated after taking senna for three days, make an appointment to speak with your doctor.
Comer una dieta saludable, beber mucha agua y hacer ejercicio suave regularmente pueden ayudar a prevenir el estreñimiento.
De un vistazo
Senna is a stimulant laxative used to treat constipation.
It works by encouraging bowel muscles to move stools through your body.
You should take senna in the evening, as it usually works within 8-12 hours.
Do not use senna for more than a few days.
Stop taking senna if you experience stomach pain, cramps, or diarrhoea.
See a doctor or pharmacist before use if you are pregnant, breastfeeding, or giving it to a child under 12.
Consult a doctor if still constipated after three days of taking senna.
About senna
Tipo de medicamento | A stimulant laxative |
Usado para | Estreñimiento |
También llamado | Senokot® |
Disponible como | Tabletas y medicina líquida oral |
Constipation is a common problem. It can mean either going to the toilet less often than usual to empty your bowels, or passing hard or painful stools. Constipation can be caused by a number of things. Not eating enough fibre or not drinking enough fluid can cause constipation. Some conditions (such as pregnancy) can cause constipation, as can a lack of exercise or movement (such as being ill in bed) and some medicines.
Often, increasing the amount of fibre in your diet (such as by eating more fruit, vegetables, cereals, and wholemeal bread) and drinking plenty of water each day can effectively prevent or relieve constipation.
You could be recommended senna as a laxative to help relieve constipation if you cannot increase the fibre in your diet, or if this is insufficient. Senna works by encouraging the muscles in your bowel to move stools through your body. This helps you to go to the toilet. It usually has an effect within 8-12 hours. It is available to buy without a prescription at pharmacies and other retail outlets.
Before taking senna
To make sure that this is the right treatment for you, before you start taking senna it is important that you speak with your doctor or a pharmacist if:
You are pregnant or breastfeeding. This is because, if you are expecting a baby or breastfeeding, medicines should only be taken on the advice of a doctor or nurse.
It is intended for a child under 12 years old. Laxatives should only be given to children on the advice of a doctor, or a healthcare professional experienced in the management of constipation in children.
You are so constipated that you think you may have a blockage.
You are taking or using any other medicines. This includes any medicines you are taking which are available to buy without a prescription, as well as herbal and complementary medicines.
You have ever had an allergic reaction to a medicine.
How to take senna
Before taking senna, read the manufacturer's printed information leaflet from the pack. It will give you more information about the medicine and will provide you with a full list of the side-effects which you could experience.
The usual adult dose is two to four 7.5 mg tablets, or two to four 5 ml spoonfuls (10-20 ml) of liquid medicine once a day. Take senna in the evening. It should only be used for a few days - this is because your bowel can start to rely on this type of laxative to make it work rather than working on its own. If you are still constipated after taking senna for three days, you should make an appointment to speak with your doctor.
If a doctor or healthcare professional has recommended senna for your child, check the label on the pack carefully to make sure that you give the correct dose for the age of your child.
Obteniendo el máximo de tu tratamiento
It is important for you to drink plenty while you are constipated. Adults should aim to drink at least two litres (about 8-10 cups) of fluid per day. Most sorts of drink will do but, as a start, try just drinking a glass of water 3-4 times a day in addition to what you normally drink.
Intenta comer una dieta equilibrada que contenga alimentos ricos en fibra, como panes y cereales integrales, frutas y verduras, arroz integral y pasta integral. Si no estás acostumbrado a una dieta alta en fibra, puede ser mejor aumentar la cantidad de fibra que consumes gradualmente.
Mantener tu cuerpo activo te ayudará a mantener en movimiento tu sistema digestivo, así que intenta hacer ejercicio diario de forma regular.
You may wish to include some foods in your diet that contain sorbitol. Sorbitol is a naturally occurring sugar. It is not digested very well and draws water into your bowel which has an effect of softening stools. Fruits (and their juices) which have a high sorbitol content include apples, apricots, gooseberries, grapes (and raisins), peaches, pears, plums, prunes, raspberries and strawberries.
You can read more about how to prevent or treat constipation in the separate condition leaflets called Estreñimiento (for adults) and Estreñimiento en niños.
Can senna cause problems?
Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains some of the ones which can occur with senna. You will find a full list in the manufacturer's information leaflet supplied with your medicine. Speak with your doctor or pharmacist if any of the following continue or become troublesome.
Side-effects of senna | ¿Qué puedo hacer si experimento esto? |
Stomach pain or cramp, diarrhoea | Stop taking senna |
If you experience any other symptoms which you think may be due to senna, please speak with your doctor or pharmacist for further advice.
How to store senna
Mantenga todos los medicamentos fuera del alcance y 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
Si compras algún medicamento, consulta con un farmacéutico que sea seguro tomarlo junto con tus otros medicamentos.
Nunca tome más de la dosis prescrita. Si sospecha que usted u otra persona podría haber tomado una sobredosis de este medicamento, acuda al departamento de accidentes y emergencias de su hospital local. Lleve el envase con usted, incluso si está vacío.
Si vas a someterte a una operación o tratamiento dental, informa a la persona que realiza el tratamiento sobre los medicamentos que estás tomando.
Do not keep out-of-date or unwanted medicines. Take them to your local pharmacy who will dispose of them for you.
Si tienes alguna pregunta sobre este medicamento, consulta a tu farmacéutico.
Informar efectos secundarios de un medicamento o vacuna
Si experimenta efectos secundarios, puede reportarlos en línea a través de Sitio web de Yellow Card.

¿Inseguro sobre mezclar medicamentos?
Verifica posibles interacciones entre medicamentos, suplementos y alimentos antes de tomarlos juntos.
Preguntas frecuentes
Why is senna usually taken in the evening?
Senna typically takes 8-12 hours to work. Taking it in the evening allows it to work overnight, leading to a bowel movement the following morning.
Can I take more than the recommended dose of senna if I'm still constipated?
No, you should never take more than the prescribed dose. If you are still constipated after three days of taking senna as directed, you should stop taking it and make an appointment to speak with your doctor.
What should I do if I forget to take my senna dose?
The article does not specify what to do if a dose is missed. It's best to take your next dose at the usual time and not double up to make up for a forgotten one. If you are concerned, speak to a pharmacist.
Are there any natural ways to help soften stools that can be used alongside senna?
Yes, some fruits (and their juices) contain sorbitol, a natural sugar that is not easily digested and draws water into your bowel to help soften stools. Examples include apples, apricots, gooseberries, grapes, peaches, pears, plums, prunes, raspberries, and strawberries.
How long should I expect to use senna for?
Senna should only be used for a few days. Using it for longer periods can make your bowel dependent on the laxative rather than working on its own. If constipation continues after three days, you should consult your doctor.
Lecturas adicionales y referencias
- Manufacturer's PIL, Senokot® 7.5 mg Tablets Adult; Reckitt Benckiser Healthcare (UK) Ltd, The electronic medicines Compendium. Dated August 2021.
- Manufacturer's PIL, Senokot® 7.5 mg/5ml Syrup 12 Years Plus; Forum Health Products Ltd, The electronic Medicines Compendium. Dated May 2024.
- Medicamentos Completos BNF 89ª Edición; Asociación Médica Británica y Sociedad Real de Farmacia de Gran Bretaña, Londres.
Sobre el autorVer biografía completa

Michael Stewart, MRPharmS
Gerente de Revisión de Folletos de Medicamentos – Contratista, Farmacéutico
BPharm (Hons), MRPharmS
Michael es un farmacéutico comunitario que ejerce en Midlands y South Yorkshire con más de 20 años de experiencia asesorando sobre medicamentos y condiciones médicas. Tiene una sólida formación en capacitación en atención médica, habiendo producido e impartido cursos de formación para equipos de farmacia y personal de entornos de atención residencial, incluidas enfermeras. También ha contribuido a juntas asesoras de farmacia para la gestión de condiciones de baja gravedad en la comunidad.
Acerca del revisor

Sid Dajani
Sultan Dajani se graduó en la Escuela de Farmacia de Londres en 1994 y se convirtió en el miembro más joven elegido para el consejo de la Sociedad Real de Farmacia desde su fundación en 1842.
Historial del artículo
La información en esta página está escrita y revisada por pares por clínicos calificados.
Artículo también disponible en Inglés, Alemán, Español, Francés, Italiano, Portugués, Hindi, Hebreo, Árabe, y Sueco.
Próxima revisión: 25 Nov 2027
12 Nov 2024 | Última versión

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