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What CAV is

CAV is the name of a combination of chemotherapy drugs used to treat small cell lung cancer and small cell cancers in other parts of the body. It is made up of the drugs

  • C = Cyclophosphamide
  • A = Doxorubicin (also called Adriamycin)
  • V = Vincristine

How you have CAV treatment

You have these drugs into your bloodstream (intravenously). Doxorubicin is a red fluid. Vincristine and cyclophosphamide are clear fluids. You can have them through a thin, short tube (a cannula) put into a vein in your arm each time you have treatment. Or you may have chemotherapy through a central line, a portacath or a PICC line. These are long, flexible tubes that give the chemotherapy into a large vein in the chest. These lines stay in throughout your whole course of treatment.

You usually have CAV chemotherapy as cycles of treatment. Depending on your needs, you may have between 4 and 6 cycles. Each cycle of treatment lasts 3 weeks.

On the first day you have slow injections of doxorubicin and vincristine into your cannula or central line alongside a salt water (saline) drip. You then have a short drip (infusion) or slow injection of cyclophosphamide. It takes about an hour to give all 3 drugs. Then you have no treatment for 3 weeks. This completes one cycle of your treatment. You then begin another cycle.

The side effects of a combination of drugs are usually a mixture of those of each drug. The combination may increase or decrease your chance of getting each side effect or it may change the severity. The side effects associated with CAV are listed below. You can use the underlined links to find out more about each one. For general information, see our cancer drugs side effects section.


Common side effects

More than 10 in every 100 people have one or more of the side effects listed below.

  • An increased risk of getting an infection from a drop in white blood cells – it is harder to fight infections and you can become very ill. You may have headaches, aching muscles, a cough, a sore throat, pain passing urine, or you may feel cold and shivery. If you have a severe infection this can be life threatening. Contact your treatment centre straight away if you have any of these effects or if your temperature goes above 38°C. You will have regular blood tests to check your blood cell levels
  • Tiredness and breathlessness due to a drop in red blood cells (anaemia) – you may need a blood transfusion
  • Bruising more easily due to a drop in platelets – you may have nosebleeds, bleeding gums after brushing your teeth, or lots of tiny red spots or bruises on your arms or legs (known as petechia)
  • Tiredness and weakness (fatigue) during and after treatment – most people find their energy levels are back to normal within 6 months to a year
  • Feeling or being sick is usually well controlled with anti sickness medicines
  • Complete hair loss – almost every one treated with CAV has complete head and body hair loss. It usually begins 2 to 5 weeks after the treatment starts. Remember that the hair will grow back after treatment. Using a cold cap may help to prevent hair loss with this combination of drugs
  • A sore mouth and throat about 5 days after each treatment, which gradually clears up over a couple of weeks
  • Mouth ulcers
  • A metallic taste in your mouth or a loss of taste
  • Urine may become a pink or red colour for 1 or 2 days after having doxorubicin, but this won't harm you
  • Sensitivity to sunlight – don’t sit out in the sun, and do cover up or use sun block on exposed skin
  • Changes to your nails
  • Dark lines may appear in the creases of your elbows and knees
  • Severe constipation with abdominal pain affects 1 out of 3 people (33%) who have vincristine – you can usually prevent this with regular laxatives. Tell your doctor or nurse if you are constipated for more than 3 days
  • Vincristine can temporarily stop the normal muscle contractions of the bowel, causing sickness, a swollen abdomen and cramps
  • Women may stop having periods but this may be temporary
  • Loss of fertility – you may not be able to become pregnant or father a child after treatment with this drug. Talk to your doctor before starting treatment if you think you may want to have a baby in the future. Men may be able to store sperm before starting treatment

Occasional side effects

Between 1 and 10 in every 100 people have one or more of these.

  • Inflammation around the drip site caused by chemotherapy drugs leaking into the tissues around your drip site. Tell your nurse or doctor straight away if you have any stinging or burning, leakage of fluid, or redness or swelling around your drip site during or after treatment
  • Jaw pain, caused by vincristine affecting your nerves
  • Fevers and chills
  • An allergic reaction to doxorubicin affects around 3 people out of 100 (3%) – you may have a sudden rash of pink, itchy bumps on your skin and a reddening of the skin along the veins, which should clear up within a few days
  • Skin may become dry, flaky, and feel sore and hot in areas treated with radiotherapy in the past – this goes away on its own but keep affected areas out of the sun
  • Diarrhoea – drink plenty of fluids and tell your doctor or nurse if diarrhoea becomes severe or continues for more than 3 days

Rare side effects

Fewer than 1 in 100 people have these effects.

A very small number of people have damage to heart muscle from doxorubicin. This is usually temporary but for a small number of people may be permanent. Your doctor will check your heart before and after your treatment.

The following rare side effects usually go back to normal within 2 months of finishing vincristine treatment. Tell your doctor or nurse if you have any of them. 

  • Muscle cramps
  • Staggering
  • Bone pain
  • Blurred or double vision
  • Hearing loss or dizziness
  • Confusion
  • Depression
  • Hallucinations (seeing or hearing things that are not there)

Important points to remember

You may have 1 or 2 or a few of the side effects mentioned. A side effect may get worse through your course of treatment. Or you may have more side effects as the course goes on. This depends on

  • How many times you've had a drug before
  • Your general health
  • How much of the drug you have (the dose)
  • Other drugs you are having

Coping with side effects

Talk to your doctor, pharmacist or nurse about all your side effects so they can help you manage them. They can give you advice or reassure you. Your nurse will give you a contact number to ring if you have any questions or problems. If in doubt, call them.

Other medicines

Tell your doctor about any other medicines you are taking, including vitamins, herbal supplements and over the counter remedies. Some drugs can react together.

Pregnancy and contraception

These drugs may harm a baby developing in the womb. It is important not to become pregnant or father a child while you are having treatment with this drug and for a few months afterwards. Talk to your doctor or nurse about effective contraception before starting treatment.


Do not breastfeed during this treatment because the drugs may come through in the breast milk.


Immunisations and chemotherapy

You should not have immunisations with live vaccines while you are having chemotherapy or for at least 6 months afterwards. In the UK, these include rubella, mumps, measles (usually given together as MMR), BCG, yellow fever and Zostavax (shingles vaccine).

You can have other vaccines, but they may not give you as much protection as usual until your immune system has fully recovered from your chemotherapy. It is safe to have the flu vaccine.

It is safe for you to be in contact with other people who've had live vaccines as injections. There can be problems with vaccines you take by mouth (oral vaccines), but not many people in the UK have these now. So there is usually no problem in being with any baby or child who has recently had any vaccination in the UK. You might need to make sure that you aren't in contact with anyone who has had oral polio, cholera or typhoid vaccination recently, particularly if you live abroad.


Related information


More information about CAV drugs

This page does not list all the very rare side effects of this treatment that are very unlikely to affect you. For further information look at the Electronic Medicines Compendium website at

If you have a side effect not mentioned here that you think may be due to this treatment you can report it to the Medicines Health and Regulatory Authority (MHRA) at

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Updated: 2 July 2014