Séné pour la constipation
Senokot
Revu par Sid DajaniDernière mise à jour par Michael Stewart, MRPharmSDernière mise à jour 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.
Manger une alimentation saine, boire beaucoup d'eau et faire régulièrement de l'exercice doux peuvent tous aider à prévenir la constipation.
En un coup d'œil
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
Type de médicament | A stimulant laxative |
Utilisé pour | Constipation |
Aussi appelé | Senokot® |
Disponible sous forme de | Comprimés et médicaments liquides oraux |
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.
Vous avez déjà eu une réaction allergique à un médicament.
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.
Tirer le meilleur parti de votre traitement
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.
Essayez de manger un régime équilibré contenant des aliments riches en fibres tels que des pains et céréales complets, des fruits et légumes, du riz brun et des pâtes complètes. Si vous n'êtes pas habitué à un régime riche en fibres, il peut être préférable d'augmenter progressivement la quantité de fibres que vous consommez.
Garder votre corps actif vous aidera à maintenir votre système digestif en mouvement, alors essayez de faire de l'exercice quotidiennement.
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 Constipation (for adults) and Constipation chez les enfants.
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 | Que puis-je faire si je ressens cela ? |
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
Gardez tous les médicaments hors de la portée et de la vue des enfants.
Conserver dans un endroit frais et sec, à l'abri de la chaleur et de la lumière directes.
Informations importantes sur tous les médicaments
Informations importantes sur tous les médicaments
Si vous achetez des médicaments, vérifiez avec un pharmacien qu'ils sont sans danger à prendre avec vos autres médicaments.
Ne prenez jamais plus que la dose prescrite. Si vous soupçonnez que vous ou quelqu'un d'autre avez pris une surdose de ce médicament, rendez-vous au service des urgences de votre hôpital local. Emportez le contenant avec vous, même s'il est vide.
Si vous subissez une opération ou un traitement dentaire, informez la personne qui effectue le traitement des médicaments que vous prenez.
Do not keep out-of-date or unwanted medicines. Take them to your local pharmacy who will dispose of them for you.
Si vous avez des questions concernant ce médicament, demandez à votre pharmacien.
Signaler les effets secondaires d'un médicament ou d'un vaccin
Si vous ressentez des effets secondaires, vous pouvez les signaler en ligne via le Site web de Yellow Card.

Vous n'êtes pas sûr de mélanger des médicaments ?
Vérifiez les interactions possibles entre les médicaments, les compléments et les aliments avant de les prendre ensemble.
Questions fréquemment posées
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.
Lectures complémentaires et références
- 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.
- Médicaments Complets BNF 89e Édition; Association Médicale Britannique et Société Royale Pharmaceutique de Grande-Bretagne, Londres.
À propos de l'auteurVoir la biographie complète

Michael Stewart, MRPharmS
Responsable de l'examen des notices de médicaments – Contractuel, Pharmacien
BPharm (Hons), MRPharmS
Michael est un pharmacien communautaire exerçant dans les Midlands et le South Yorkshire avec plus de 20 ans d'expérience dans le conseil sur les médicaments et les conditions médicales. Il possède une solide expérience en formation dans le domaine de la santé, ayant produit et dispensé des cours de formation pour les équipes de pharmacie et le personnel des établissements de soins résidentiels, y compris les infirmières. Il a également contribué aux comités consultatifs de pharmacie pour la gestion des affections de faible gravité dans la communauté.
À propos du critique

Sid Dajani
Sultan Dajani a obtenu son diplôme à la London School of Pharmacy en 1994 et est devenu le plus jeune membre élu du conseil de la Royal Pharmaceutical Society depuis sa fondation en 1842.
Historique de l'article
Les informations sur cette page sont rédigées et examinées par des cliniciens qualifiés.
Article également disponible en Anglais, Allemand, Espagnol, Français, Italien, Portugais, Hindi, Hébreu, Arabe, and Suédois.
Prochaine révision prévue : 25 nov. 2027
12 nov. 2024 | Dernière version

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