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Leustat injection (Cladribine)

Last updated on: October 24, 2021

Leustat injection. Cladribine

What Leustat is and what it is used for

Leustat injection (Cladribine)Leustat contains a medicine called cladribine. This belongs to a group of medicines used to treat cancer (called ‘cytotoxic drugs’).

Leustat is for:

  • An illness caused by the abnormal growth of white blood cells. This is called ‘hairy cell leukaemia’
  • An illness caused by the abnormal growth of a type of white blood cell called ‘lymphocytes’. This illness is called ‘B-cell chronic lymphocytic leukaemia’. In this case, Leustat is used when the first treatment (called an ‘alkylating agent’) has not worked or has stopped working

Leustat works by killing abnormal white blood cells.

Before you are given Leustat

Do not have Leustat if:

  • You are allergic to anything in Leustat.

Take special care

Talk to your doctor before you are given Leustat if:

  • You are suffering from any infection or fever
  • You have ever had kidney or liver problems
  • You have ever had bone marrow or blood problems

You may still be able to have Leustat, but you should discuss this with your doctor first.

Taking other medicines

Please tell your doctor or pharmacist if you are taking or have recently taken any other medicines. This includes medicines that you buy without a prescription or herbal medicines. In particular tell your doctor if you are already taking or are to be given:

  • A live vaccine while being treated with Leustat
  • Medicines to treat viral infections including HIV (such as didanosine, tenofovir, adefovir)

Blood tests

Your doctor will arrange regular blood tests before and during your treatment. The blood tests check that your liver and kidneys are working properly. They also check how the Leustat treatment is working

If you visit another hospital or your family doctor for a blood test, tell them that you have been given Leustat. This is because Leustat may affect the result of blood tests

Leustat injection (Cladribine)Pregnancy and breast-feeding

Do not use this medicine if you are pregnant, think you may be pregnant or might become pregnant. This is because it may affect the baby.

You must not breast-feed while you are being treated with Leustat, or for 6 months after your treatment ends.

Ask your doctor or pharmacist for advice before taking any medicine if you are pregnant or breast-feeding.

Family planning

Men should not father a child until at least 6 months after the last dose of Leustat.

Driving or using machines

Your illness and its treatment may affect you being able to drive. Do not drive or use any tools or machines without discussing this with your doctor first.

Important information about an ingredient of Leustat

If you need to control your salt intake (controlled sodium diet) be aware that:

  • Each Leustat vial contains 1.55 mmol sodium (35.4 mg)
  • The contents of the vial are diluted in a salt solution (called ‘saline’) before being given to you. This salt solution also contains sodium

How Leustat is used

Leustat is put in a drip and given slowly into a vein. It is normally diluted in a salt solution (called ‘saline’). A doctor experienced at using this type of medicine will give it to you. Check with your doctor or nurse if you are not sure about anything.

Adults and the elderly

The dose of Leustat is based on your body weight in kilograms.

For abnormal growth of hairy white blood cells:

  • The usual dose is 0.09 mg per kilogram each day
  • The dose is given over 24 hours every day for 7 days, without a break

For abnormal growth of lymphocyte white blood cells:

  • The usual dose is 0.12 mg per kilogram each day
  • The dose is given every day for 5 days
  • Each dose is normally given over 2 hours
  • The 5 day course is repeated every 28 days
  • You can receive a maximum of 6 of these courses


Leustat has not been fully tested for use in children.

If you have too much Leustat

Tell your doctor or nurse straight away if you think you have been given too much Leustat.

Possible side effects

Like all medicines, Leustat can cause side effects, although not everybody gets them. Some side effects may be the same as symptoms of the illness. Your doctor may decide to delay or stop using Leustat if you get side effects.

Tell your doctor or nurse straight away if you notice any of the following serious side effects. You may need urgent medical treatment.

  • The sudden appearance of rash, itching, hives (also known as nettle rash or urticaria), swollen face or lips, or shortness of breath. These may be signs of an allergic reaction.
  • Fever and chills (affects more than 1 in 10 people). These may be the first signs that you have an infection. The infection may happen because of a fall in the number of white blood cells (neutropenia). Some infections are more common than others. Infection can happen anywhere in your body including:
  • Your chest (cough, shortness of breath or difficulty breathing, noisy breathing, pneumonia)
  • Your urinary system (pain or discomfort on passing water)
  • Your skin (bacterial, fungal or viral infections that may leave the skin tender, hot or red)
  • Your mouth (a fungal infection called thrush)
  • Your gut (infection or inflammation of the intestines)
  • Your blood (septicaemia)
  • Easier bruising and bleeding under the skin (thrombocytopenia) or red or purple spots under the skin (petechiae). This can be caused by a fall in the number of small blood cells called platelets (affects more than 1 in 10 people) or problems with blood clotting.
  • Feeling weak or breathless. This can be caused by a fall in the number of red blood cells (anaemia). The anaemia may be severe (affects more than 1 in 10 people)
  • Build-up of fluid under the skin called oedema (affects more than 1 in 10 people)
  • Swelling and clotting in a vein called phlebitis (affects less than 1 in 10 people)
  • Stevens-Johnson syndrome (a serious illness with blistering of the skin, mouth, eyes and genitals) (affects less than 1 in 100 people)
  • Tumour lysis syndrome (a serious condition resulting from breakdown of tumour cells. This can lead to heart and kidney problems, weakness and fits) (affects less than 1 in 100 people)

Tell your doctor or nurse at your next appointment if you notice any of the following side effects:

Very common (affects more than 1 in 10 people)

  • Feeling dizzy or tired
  • Headache
  • Rash, sweating
  • Feeling sick (nausea), being sick (vomiting)
  • Redness, swelling or pain where the injection was given

Common (affects less than 1 in 10 people)

  • Faster heart beat
  • Stomach pain or wind (flatulence)
  • Having less appetite
  • Constipation or diarrhoea
  • Joint pain, muscle pains or weakness
  • Generalised pain
  • Anxiety or difficulty sleeping (insomnia)
  • Itching (pruritus)
  • Conjunctivitis
  • Generally feeing unwell

Uncommon (affects less than 1 in 100 people)

  • A problem that affects the body being able to produce white blood cells, red blood cells and small blood cells (platelets). The effects may need further treatment
  • An increase in a particular type of white blood cell (eosinophil)
  • A decrease in the ability of your kidneys being able to get rid of waste products from the blood, and a decrease in urine production
  • Serious nerve damage. The effects include partial or complete paralysis and may be permanent
  • An increase in liver enzymes (shown in blood tests)
  • Confusion, reduced consciousness, co-ordination problems (ataxia)

If any of the side effects gets serious, or if you notice any other side effects not listed in this leaflet, please tell your doctor or nurse.

How Leustat is stored

The vials are stored unopened in a hospital refrigerator where children can’t see or reach them. Vials should be protected from light.

Do not use Leustat after the expiry date stated on the label. The expiry date refers to the last day of that month.

Do not use Leustat if:

  • The seal is broken or a dose has already been taken from the vial
  • The liquid is coloured or you can see particles floating in it
  • It has been diluted and refrigerated for more than 8 hours
  • It has been diluted with a solution of 5% dextrose

Further information

The active substance in Leustat is cladribine (1 mg/ml).

The other ingredients are sodium chloride, phosphoric acid, dibasic sodium phosphate heptahydrate and water for injection.

What Leustat looks like and contents of the pack

Leustat is supplied in a clear glass vial containing 10 ml of a clear, colourless liquid.

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