Zeffix Tablets

Zeffix Tablets is a brand of medicine containing the active ingredient lamivudine.

Find out more about active ingredients.

Consumer medicine information (CMI) leaflet

Developed by the pharmaceutical company responsible for this medicine in Australia, according to TGA regulations.



Consumer Medicine Information

What is in this leaflet?

Please read this leaflet carefully before you take Zeffix Tablets.

This leaflet answers some common questions about Zeffix Tablets. It does not contain all of the available information.

It does not take the place of talking to your doctor or pharmacist.

All medicines have risks and benefits. Your doctor has weighed the expected benefits of you taking Zeffix against the risks this medicine could have for you.

If you have any concerns about taking this medicine, ask your doctor or pharmacist.

Keep this leaflet with the medicine. You may need to read it again.

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What is Zeffix used for?

Zeffix belongs to a group of medicines called antivirals.

Zeffix is used to treat patients 2 years of age or over with long term (chronic) viral infection of the liver caused by hepatitis B.

Hepatitis B is a virus which damages the liver. Treatment with Zeffix can reduce the amount of hepatitis B virus in your body. This should lead to less liver damage.

Zeffix has not been shown to reduce the risk of passing hepatitis B to others. You will still be able to pass on the hepatitis virus by sexual contact or through your blood. You should use appropriate precautions.

Your doctor may have prescribed Zeffix for another reason.

Zeffix is not addictive.

If you are already taking this medicine lamivudine for HIV infection (3TC®, Combivir®), your doctor will continue to treat you with the higher dose for that treatment.

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Before you take Zeffix

Do not take if:

You must not take Zeffix if:

  • you have ever had an allergic reaction to lamivudine or any of the ingredients listed toward the end of this leaflet. (See "Ingredients")
  • you are taking zalcitabine.
  • the expiry date (EXP) printed on the pack has passed.
  • the packaging is torn or shows signs of tampering

Tell your doctor if:

You must tell your doctor if:

  • you are allergic to foods, dyes, preservatives or any other medicines.
  • you have, or have ever had, kidney problems.
  • you have, or have ever had, problems with your pancreas.
  • you are taking any other medicines, including medicines you buy without a prescription.
  • you are breastfeeding, pregnant or trying to become pregnant.

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How do I take Zeffix?

How much to take

Take Zeffix as directed by your doctor or pharmacist.

The normal dose for adults and children aged 12 years or above is one 100 mg tablet once a day. Your doctor may prescribe a different dosage, for example if you have kidney problems. Each patient responds to the treatment differently. Your doctor will check you by taking regular blood samples. The results will help decide when you should stop taking Zeffix.

Zeffix Oral Solution is available for use in children and those patients who cannot take the tablets.

How to take it

Zeffix tablets should be swallowed whole with a glass of water, and can be taken with or without food.

How long to take it for

In order for Zeffix Tablets to be effective, you must take Zeffix Tablets every day for as long as your doctor says you should take them.

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What do I do if I take too much? (Overdose)

Immediately telephone your doctor or Poisons Information Centre (telephone 131126) for advice, if you think you or anyone else may have taken too much Zeffix, even if there are no signs of discomfort or poisoning.

If you are not sure what to do, contact your doctor or pharmacist.

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While you are taking Zeffix

Things you must do

Tell your doctor if, for any reason, you have not taken your medicine exactly as directed. Otherwise, your doctor may think that it was not working as it should and change your treatment unnecessarily.

If you forget to take a dose, do not take a double dose to make up for the dose that you missed.

Things you must not do

Do not stop taking Zeffix tablets, or change the dose without first checking with your doctor. If you stop taking Zeffix your hepatitis may get worse.

This can cause serious illness particularly if your liver is already not working very well. If you do have to stop taking Zeffix your doctor is likely to arrange tests over the following four months to check how well your liver is working.

Do not give this medicine to anyone else, even if their symptoms seem similar to yours.

Do not use Zeffix to treat any other complaints unless your doctor says to.

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What are the side-effects?

Check with your doctor as soon as possible if you think you are experiencing any side effects or allergic reactions due to taking Zeffix, even if the problem is not listed below.

Like other medicines, Zeffix can cause some side-effects. If they occur, they are most likely to be minor and temporary. However, some may be serious and need medical attention.

The most commonly reported side-effects are:

  • Headache.
  • Vomiting and Diarrhoea.
  • Nausea.
  • Fatigue/tiredness.
  • Abdominal discomfort and pain.
  • Coughing, with phlegm, not associated with a cold or flu.
  • Dizziness.
  • Abnormal Liver function tests.
  • Muscle disorders, (including muscle pain and cramps).

Tell your doctor immediately if you notice any of the following:

  • Wheezing, swelling of the lips/mouth, difficulty in breathing, hayfever, lumpy rash (hives) or fainting. These could be symptoms of an allergic reaction.

This is not a complete list of all possible side-effects. Others may occur in some people and there may be some side-effects not yet known.

Do not be alarmed by this list of possible side-effects. You may not experience any of them.

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How do I store Zeffix?

Keep this medicine where children cannot reach it, such as in a locked cupboard.

Do not leave in a car, on a window sill or in the bathroom.

Keep Zeffix tablets in a cool, dry place where it stays below 30°C.

Keep Zeffix tablets in the blister pack until it's time to take them.

Return any unused or expired medicine to your pharmacist.

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Product description

What Zeffix Tablets look like

The tablets are butterscotch coloured, film-coated, capsule shaped, biconvex tablets engraved "GX CG5" on one face.

Zeffix tablets are supplied in foil blisters and are in a carton containing 28 tablets.


Zeffix tablets contain 100 mg of lamivudine. Your tablets also contain the following inactive ingredients:

Microcrystalline cellulose (460), magnesium stearate (572), titanium dioxide (171), hypromellose (464), sodium starch glycollate, polyethylene glycol, polysorbate 80 (433), yellow iron oxide CI 77192 and red iron oxide CI 77491.

Zeffix tablets do not contain lactose or gluten.


Your Zeffix is supplied by:
Aspen Pharmacare Australia Pty Ltd
34-36 Chandos Street
St Leonards NSW 2065

Where to go for further information

Pharmaceutical companies are not in a position to give people an individual diagnosis or medical advice. Your doctor or pharmacist is the best person to give you advice on the treatment of your condition.

This leaflet was prepared on
30 November 2011

The information provided applies only to: Zeffix® Tablets.
Zeffix®is a registered trade mark of Aspen Global Incorporated.

Zeffix: AUST R 66828

© 2011 Aspen Global Incorporated.

Version 4.0

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CMI provided by MIMS Australia, September 2016  

Related information - Zeffix Tablets


27 Feb 2013 Information on medicines available in Australia containing lamivudine, including our latest evidence-based information and resources for health professionals and consumers. The active ingredient is the chemical in a medicine that makes it work. Medicines that contain the same active ingredient can be available under more than one brand name. Brands include both active ingredients and inactive ingredients. You'll find information about brands of medicines that contain lamivudine below, including their consumer medicine information (CMI) leaflets.