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Duphalac Lactulose Oral Liquid 500ml
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Duphalac Lactulose Oral Liquid 500ml

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What DUPHALAC is used for

DUPHALAC belongs to a group of medicines known as laxatives.

DUPHALAC is used to treat chronic constipation. It can be taken by pregnant women.

It works by increasing the amount of water and stool bulk in the bowel, promoting normal bowel activity.

DUPHALAC can also be used to treat portal-systemic encephalopathy (PSE), also known as hepatic encephalopathy (a disease of the brain that occurs when the liver is not working properly. Symptoms are caused by too much ammonia in the blood). It works by lowering the level of ammonia in the blood.

DUPHALAC can be used where a soft stool is considered of medical benefit (haemorrhoids, anal surgery).

Ask your doctor or pharmacist if you have any questions about why DUPHALAC has been prescribed or recommended for you.

Your doctor or pharmacist may have prescribed or recommended DUPHALAC for another reason.

There is no evidence that DUPHALAC is addictive.

Before you take DUPHALAC

When you must not take it

Do not take DUPHALAC if you:

  • Are allergic to lactulose, galactose, lactose or any other sugar
  • Have galactosaemia
  • Have a disaccharidase deficiency
  • Are on a low-galactose or galactose-free diet
  • Are on a lactose-free diet
  • Have a bowel obstruction (blockage other than normal constipation).

    Do not take DUPHALAC after the expiry date printed on the label or if the cap seal is broken. If it has expired or is damaged, return it to your pharmacist for disposal.

    If you are not sure whether you should start taking DUPHALAC, talk to your doctor or pharmacist.

    Before you start to take it

    Tell your doctor or pharmacist if you have allergies to:

  • any other medicines
  • any other substances, such as foods, preservatives or dyes.

    Tell your doctor or pharmacist if you have or have had any medical conditions, especially the following:

  • diabetes
  • lactose intolerance.

    Tell your doctor or pharmacist if you are breast-feeding or plan to breast-feed. Your doctor or pharmacist will discuss the possible risks and benefits of using DUPHALAC during breast-feeding.

    DUPHALAC has no or minor influence on the ability to drive and use machines.

    If you have not told your doctor or pharmacist about any of the above, tell them before you start taking DUPHALAC. Taking other medicines

    Tell your doctor or pharmacist if you are taking any other medicines, including any that you buy without a prescription from your pharmacy, supermarket or health food shop.

    How to take DUPHALAC

    Follow all directions given to you by your doctor or pharmacist carefully. They may differ from the information contained in this leaflet.

    If you do not understand the instructions, ask your doctor or pharmacist for help.

    How much to take

    Chronic Constipation

    The usual starting dose for constipation in adults is 15 to 45 mL daily, and the maintenance dose is 15 to 30 mL daily.

    It may take 1-2 days for DUPHALAC to work fully.

    DUPHALAC should be given to children and infants under medical supervision. The usual doses are:

    Infants under 1 year:

    Initial dose (first 3 days): 5 mL daily
    Maintenance dose: 5 mL daily

    Children 1-6 years:

    Initial dose (first 3 days): 5 to 10 mL daily
    Maintenance dose: 5 to 10 mL daily

    Children 7-14 years:

    Initial dose (first 3 days): 15 mL daily
    Maintenance dose: 10 to 15 mL daily

    As a general rule, patients with constipation should drink plenty of water and increase the amount of fibre in their diet.

    Portal-Systemic Encephalopathy

    The usual dose is 30 to 45 mL three to four times daily.

  • Delivery Costs

    Free Shipping

    Standard Parcels (under 3kg) over $99 = FREE!

    Parcels under 3kg & under $99 = $7.95
    Parcels over 3kg or bulky over $99 = $12.95
    Parcels over 3kg or bulky under $99 = $16.95


    We offer Express Shipping for parcels up to 3kg

    Parcels under 1kg = $12.95
    Parcels between 1-3kg = $16.95

    - Express shipping is not available to PO Box addresses.
    - Signature is required on delivery.

    Your Discount Chemist use Australia Post to deliver standard parcels and Toll Priority for express shipping requests.

    We use Australia Post & Toll

    Delivery Time

    Parcels arrive within 3-7 business days.
    Express shipped parcels arrive within 1-3 business days (this may be slightly longer for remote country areas).

    Overseas Shipping

    International orders other than New Zealand will be charged at the cost price. Once you place your order one of our staff will email you with the cost of delivery, you have the option of agreeing and proceeding with the order or declining and receiving a full refund. Note: Perfumes cannot be sent overseas.


    Your Discount Chemist use DHL for international orders.


    We use DHL

    New Zealand Shipping Rates:

    Parcels up to 500g = $12.95
    Parcels between 0.5-1kg = $24.95
    Parcels between 1-1.5kg = $29.95
    Parcels between 1.5-2kg = $39.95
    Parcels between 2-2.5kg = $44.95
    Parcels between 2.5-3kg = $49.95

    All New Zealand orders over 3kg will be charged at cost - we will email you after you complete your order.

    Click here for more detailed information regarding shipping.


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