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  • Duphalac Laxative Syrup (Lactulose) 200ml
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Duphalac Laxative Syrup (Lactulose) 200ml

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Product Notice
To Purchase this product, you will need to answer a medical questionnaire after you select 'add to basket'
Limited to 3 per order
Free Delivery
Over £30
Discreet Delivery
 To Buy This Product You Must Answer the Below Questions

Pharmacy medicines are sold at the professional discretion of our pharmacist. Please answer the following questions accurately to allow our pharmacist to check that this product is suitable for the intended user(s). All information provided will be treated confidentially and will only be available to pharmacy staff processing your order.

Important: Our pharmacists only have access to the details you provide in this form. They don't have access to patient information provided online on previous occasions. If your previous responses are shown below, please check that your answers are still correct.

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(Please describe typical symptoms even if you are not currently suffering from them)

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Warning Maximum Product Quantity of 3

Duphalac Laxative Syrup (Lactulose) 200ml


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What is Duphalac Laxative Syrup?

Duphalac Laxative Syrup is a form of treatment for constipation that makes stool easier to pass by drawing water to the bowel. The active ingredient is lactulose, which is effective in treating constipation and allowing for the body to return to its natural state.

Who is this lactulose syrup suitable for?

It is suitable for adults and children, in different dosages. For adults, the starting dosage is 15-45ml, reducing to 15-30ml. For children aged 7-14, start with 15ml before dropping to 10ml. For children aged 1-6, give them 5-10ml. You should not use this syrup if you are allergic to the lactulose. You should also not use if you have another blockage that is not caused by constipation.

Can I use if I’m pregnant or breastfeeding?

You should speak to your doctor before using.

How often should I be taking Duphalac Syrup?

You can take it as needed, though remember that it may take two or three days for it to start working. It is recommended that you drink lots of water when using this syrup.

Are there any side effects?

The most common side effect is diarrhoea. Other side effects include:

  • Flatulence
  • Nausea
  • Vomiting
  • Abdominal pain

If you notice any more serious side effects, or they persist long-term, contact your doctor.

Why do I need to answer questions before buying?

You do not need a prescription for Duphalac, however, you will be asked to complete a short medical questionnaire by your Chemist-4-U pharmacist before we can take your order. This includes some simple questions that all pharmacies legally are required to ask before supplying this kind of product. This helps our pharmacy team to be sure that Duphalac is the best choice for you.


This product is a medicine; make sure to speak with your doctor or Chemist-4-U pharmacist before taking this product if you have an underlying medical problem or are taking any other medicine or complementary therapy. If your symptoms get worse or continue after taking this product, contact us or your doctor. For medical services in your area, please refer to

If you are pregnant, trying to become pregnant, or breastfeeding, speak to your doctor or our pharmacist before taking this product. If you suffer from any allergies, ask your doctor or our pharmacist if this medicine is right for you.

Store all medicines out of sight and reach of children.

Please read the included leaflet carefully before using this product.

Please contact your GP if appropriate regarding this product.

Shipping Costs

Free UK Delivery on all orders over £30 - Delivery within 3-5 working days

Standard UK Delivery - £2.95 - Delivery within 3-5 working days


Please Note: These prices are shown as a guide only. All delivery times are approximate but have been obtained in good faith.


Discreet Delivery

All our items are sent completely discreet for your peace of mind.

This means the packaging is plain, there is no mention of what product is inside your package and there is no mention of Chemist 4 U either.

We respect that many of our products are of a sensitive nature - this is why we take every step to keep your purchases private.


Returns Information

Customers can read our full returns policy by clicking here

Don’t you just hate blockages? Whether it is in the nose and you struggle to breathe through it and smell, or whether it is a traffic jam caused by an accident that leaves you stuck on the road, they are a pain.


The same can be said about constipation, a simple blockage in the digestive system that can cause a lot of problems. To find the solution to constipation, first, you need to know the cause.

Ask a Pharmacist

Didn't find the answer you were looking for? Submit a private question to be answered by one of our qualified UK pharmacists.

* Name and email address are only captured so you can be emailed a response when your question is answered by a pharmacist. No personally identifiable information is stored or displayed at any time.