Lactulose for constipation
مراجعة من قبل Sid Dajaniآخر تحديث بواسطة Michael Stewart, MRPharmSLast updated 16 أكتوبر 2023
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Lactulose can take up to 48 hours to have an effect.
If you find the medicine makes you feel queasy, mix your dose with some water or fruit juice. Alternatively, take your doses with a meal.
Eating a healthy diet, drinking plenty of water and getting regular gentle exercise can all help prevent constipation.
At a glance
Lactulose is a laxative medicine for treating constipation.
It is available as an oral liquid and helps by drawing fluid into the bowel.
It can take up to 48 hours to work.
Drink plenty of fluids and eat high-fibre foods when taking lactulose.
Speak to a doctor if constipation does not improve after several days.
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تابع القراءة أدناه
About lactulose
نوع الدواء | An osmotic laxative |
يستخدم لـ | الإمساك |
متوفر كـ | Oral liquid medicine, liquid sachets |
الإمساك 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 will have been recommended lactulose, a laxative, to help relieve constipation if you cannot increase the fibre in your diet or if this is insufficient. Lactulose works by drawing fluid into your bowel, which makes your stools softer and easier to pass. It is available on prescription, and it can also be bought without a prescription at pharmacies.
Lactulose also changes the acidity of the stools and this helps to discourage the growth of some germs (bacteria) present in the bowel. Because of this, lactulose is also prescribed for people with a liver disease called hepatic encephalopathy. If you have been prescribed it for this reason, ask your doctor if you need further information about the medicine.
Before taking lactulose
العودة إلى المحتوياتSome 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 lactulose it is important that your doctor or pharmacist knows:
إذا كنت تعاني من الإمساك لدرجة أنك تعتقد أنك قد تكون لديك انسداد.
If you are unable to digest milk sugar (lactose intolerant).
If you have a condition called galactosaemia, where your body cannot process galactose.
If you are pregnant or breastfeeding. Lactulose is not known to be harmful to a baby, but while you are expecting or feeding a baby, you should only take medicines on the recommendation of a doctor.
If it is intended for a child. This is because laxatives should only be given to children on the advice of a doctor or healthcare professional.
إذا كنت تتناول أدوية أخرى، بما في ذلك تلك المتاحة للشراء بدون وصفة طبية، بالإضافة إلى الأدوية العشبية والمكملات الغذائية.
If you have ever had an allergic reaction to this or to any other medicine.
تابع القراءة أدناه
How to take lactulose
العودة إلى المحتوياتBefore you start the treatment, read the manufacturer's printed information leaflet from the pack. It will give you more information about lactulose and will provide you with a full list of the side-effects which you may experience.
Take lactulose exactly as your doctor tells you to, or as directed on the pack. The usual dose for constipation in an adult is 15 ml (three 5 ml spoonfuls) twice daily, although the dose you are advised to take may be different from this as it will be adjusted to suit your needs.
If a doctor or healthcare professional has recommended lactulose 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.
If you forget to take a dose, do not worry, just take the next dose when it is due. Do not take two doses together to make up for a forgotten dose.
تحقيق أقصى استفادة من علاجك
العودة إلى المحتوياتLactulose can take up to 48 hours to act, so it may take two or three days before you feel the full benefit. However, if after several days you do not feel your symptoms are improving, or if they get worse, you should speak with a doctor for further medical advice.
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.
Try to eat a balanced diet containing high-fibre foods such as wholemeal and wholegrain breads and cereals, fruit and vegetables, brown rice and wholemeal pasta. If you are not used to a high-fibre diet, it may be best to increase the amount of fibre you eat gradually.
Keeping your body active will help you to keep your digestive system moving, so try to take some regular daily exercise.
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) that 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 health information leaflets called الإمساك (for adults) and Constipation in Children.
تابع القراءة أدناه
Can lactulose cause problems?
العودة إلى المحتوياتAlong 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 lactulose. 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.
Lactulose side-effects | ماذا يمكنني أن أفعل إذا واجهت هذا؟ |
Excess wind (flatulence), tummy (abdominal) discomfort or cramps | These effects soon settle down as your body adjusts but if they continue or become troublesome, speak with your doctor or pharmacist for further advice |
الشعور بالغثيان (الغثيان) أو التقيؤ (القيء) | Try taking lactulose with meals, or mixing your dose with some water or fruit juice |
إذا شعرت بأي أعراض أخرى تعتقد أنها قد تكون بسبب الدواء، تحدث مع طبيبك أو الصيدلي للحصول على مزيد من النصائح.
How to store lactulose
العودة إلى المحتوياتاحفظ جميع الأدوية بعيدًا عن متناول الأطفال وأنظارهم.
احفظه في مكان بارد وجاف، بعيدًا عن الحرارة المباشرة والضوء.
معلومات هامة عن جميع الأدوية
العودة إلى المحتوياتمعلومات هامة عن جميع الأدوية
إذا اشتريت أي أدوية، تحقق مع الصيدلي من أنها آمنة لتناولها مع الأدوية الأخرى التي تتناولها.
لا تأخذ أبدًا أكثر من الجرعة الموصوفة. إذا كنت تشك في أنك أو شخص آخر قد تناول جرعة زائدة من هذا الدواء، اذهب إلى قسم الحوادث والطوارئ في مستشفى منطقتك. خذ العبوة معك، حتى لو كانت فارغة.
إذا كنت ستخضع لعملية جراحية أو علاج أسنان، أخبر الشخص الذي يقوم بالعلاج بالأدوية التي تتناولها.
هذا الدواء لك. لا تعطه لأشخاص آخرين حتى لو بدت حالتهم مشابهة لحالتك.
Do not keep out-of-date or unwanted medicines. Take them to your local pharmacy who will dispose of them for you.
إذا كان لديك أي أسئلة حول هذا الدواء، اسأل الصيدلي الخاص بك.
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غير متأكد من خلط الأدوية؟
تحقق من التفاعلات المحتملة بين الأدوية والمكملات الغذائية والأطعمة قبل تناولها معًا.
الأسئلة الشائعة
Can I take lactulose if I'm pregnant or breastfeeding?
Lactulose is not known to be harmful to a baby. However, if you are pregnant or breastfeeding, you should only take lactulose on the recommendation of a doctor.
How long does lactulose typically take to start working?
Lactulose can take up to 48 hours to act. This means it may take two or three days before you feel the full benefit.
What should I do if I forget to take a dose of lactulose?
If you forget to take a dose, do not worry. Just take the next dose when it is due. You should not take two doses together to make up for a forgotten dose.
Are there any tips to help reduce side-effects like excess wind or tummy discomfort from lactulose?
Excess wind, tummy discomfort, or cramps usually settle down as your body adjusts to lactulose. If you experience feeling or being sick, you can try taking lactulose with meals or mixing your dose with some water or fruit juice.
Can children take lactulose?
Laxatives, including lactulose, should only be given to children on the advice of a doctor or healthcare professional. If a doctor has recommended it for your child, carefully check the label for the correct dose based on their age.
Is it important to drink plenty of fluids while taking lactulose?
Yes, it is important to drink plenty of fluids while you are constipated. Adults should aim to drink at least two litres (about 8-10 cups) of fluid per day. Most drinks are suitable, but you can start by drinking a glass of water 3-4 times a day in addition to what you normally drink.
I've been prescribed lactulose for a liver condition. Is there anything different I should know?
Lactulose is also prescribed for a liver disease called hepatic encephalopathy because it changes the acidity of the stools and helps to discourage the growth of certain bacteria in the bowel. If you've been prescribed it for this reason, you should ask your doctor for further information about the medicine.
قراءة إضافية ومراجع
- Manufacturer's PIL, Duphalac 3.335 g/5 ml Oral Solution; Mylan Products Ltd, The electronic Medicines Compendium. Dated April 2022.
- الأدوية كاملة BNF الطبعة 89; الجمعية الطبية البريطانية والجمعية الملكية الصيدلانية لبريطانيا العظمى، لندن.
تابع القراءة أدناه
About the authorView full bio

مايكل ستيوارت، MRPharmS
Medicine Leaflet Review Manager – Contractor, Pharmacist
BPharm (Hons), MRPharmS
Michael is a community pharmacist practicing in the Midlands and South Yorkshire with more than 20 years’ experience advising on medicines and medical conditions. He has a strong background in healthcare training, having produced and delivered training courses for pharmacy teams and staff of residential care settings, including nurses. He has also contributed to pharmacy advisory boards for the management of low acuity conditions in the community.
About the reviewer

سيد داجاني
Sultan Dajani qualified at the London School of Pharmacy in 1994 and became the youngest elected member of the Royal Pharmaceutical Society council since its founding in 1842.
تاريخ المقال
تمت كتابة المعلومات على هذه الصفحة ومراجعتها من قبل أطباء مؤهلين.
المراجعة التالية مستحقة: 15 أكتوبر 2026
16 أكتوبر 2023 | أحدث إصدار

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