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Duphalac Laxative Syrup (Lactulose) – 200ml

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Paul Kelly - Medical Content Writer
Paul Kelly
James O'Loan - CEO & Superintendent Pharmacist
James O'Loan
CEO & Superintendent Pharmacist
How we ensure accuracy in our content

What is Duphalac Laxative Syrup?

Duphalax Laxative Syrup is a treatment for constipation. It works by making the stools softer and easier to move in the bowel. This is done by drawing water to the stools. No water is absorbed by the body.


What causes constipation?

Constipation can be caused by a number of different issues, and the cause is not always obvious. Constipation is the feeling of slow bowel movements or no bowel movements at all. The potential causes of constipation can include:

  • A sudden change in your diet
  • Not enough fibre in your diet
  • A lack of exercise
  • Stress or anxiety
  • Having to stay in bed for long periods
  • Pregnancy
  • Loss of bowel muscle tone
  • Certain types of medication

The feeling of constipation can make you feel bloated or heavy. It can also cause headaches.


Who is this laxative syrup suitable for?

This laxative syrup is suitable to be used by adults and children, including infants. This syrup should not be used by anyone who is allergic to the ingredients contained in the liquid. You should also not use this liquid if:

  • You have a rare condition known as galactosaemia
  • You have a blockage that is not caused by constipation, digestive perforation or at risk of digestive perforation

If you are using medication for another treatment, speak to a doctor or Chemist 4 U pharmacist before using.


Can someone who is pregnant or breastfeeding use this medication?

Speak to a medical professional before using this medicine if you are pregnant or breastfeeding.


How should Duphalac Laxative Syrup be used?

Use this liquid with a spoon or measuring cup. You can mix it with water or juice if needed. Swallow immediately, as this mixture contains sugars and it could lead to tooth decay. Duphalac can take 2-3 days to start working. The recommended dosages are:

  • Adults and children aged 14 and over: Use 15-45ml, to begin with. After this, it can be adjusted to 15-30ml as needed
  • Children 7-14: Start with 15ml, and this can be dropped to 10ml if necessary.
  • Children 1-6: 5-10ml a day
  • Children under 1 year of age: 5ml only. This medicine should not be used without medical advice.

If problems still persist when using this liquid, speak to a doctor or Chemist 4 U for advice.


Are there any side effects?

Like with many medicines, there is a chance of side effects. Potential side effects include:

  • Diarrhoea
  • Flatulence
  • Nausea
  • Vomiting
  • Abdominal pain

If you notice a side effect, stop using and speak to a doctor or Chemist 4 U pharmacist as soon as possible. You can also record a side effect using the MHRA Yellow Card Scheme.


Why do I need to answer questions to buy this product?

You do not need a prescription for Duphalac Laxative Syrup, 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.


More Information

This product is a medicine; make sure to speak to 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.


Helpful Advice on Medication Restrictions & Addiction

For further information on our medication restrictions policy, please click here.

If you are concerned about addiction to 'over the counter' medication, we urge you to visit the below links for professional help and advice:

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Shipping Times

MethodHandling TimeTransit TimeTimescaleApprox Cost
Standard Shipping (3-5 Working Days)n/an/an/a£0.00
Royal Mail Tracked 24n/an/an/a£4.95
Sons Tracked 24n/an/an/a£3.90
Sons Tracked 48n/an/an/a£2.90

Times are given in working days and are approximate. Costs may change based on order total, day of the week or location within the UK. Ability to hit timescales will depend on whether the products are ordered before a cut off time, as well as additional administration time incurred in reviewing your order.

Please review the estimates at the checkout.

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.

Express UK Delivery - £4.95** - Delivery within 1-2 working days.

Temperature Controlled Delivery - £8.85 - Delivery within 1-3 working days.

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

*Excluding refrigerated products and treatments which are subject to different postage charges.


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 Chemist4U 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

Duphalac Laxative Syrup (Lactulose) – 200ml Reviews

Dorina Dorina,
Very good product

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