TAC is a chemotherapy treatment used to treat breast cancer.
This information is best read with our general information about chemotherapy and breast cancer.
TAC is named after the initials of the drugs used for treatment. The drugs are:
You will be given TAC in the chemotherapy day unit. A chemotherapy nurse will give it to you. During treatment, you usually see a cancer doctor, a chemotherapy nurse or a specialist nurse. This is who we mean when we mention doctor or nurse in this information.
Before or on the day of treatment, a nurse or person trained to take blood (phlebotomist) will take a blood sample from you. This is to check that it is okay for you to have chemotherapy.
You will also see a doctor or nurse before you have chemotherapy. They will ask you about how you have been. If your blood results are alright on the day of your treatment, the pharmacist will prepare your chemotherapy. Your nurse will tell you when your treatment is likely to be ready.
You will be given steroid tablets to take the day before your chemotherapy and for two days after. These help to prevent an allergic reaction to docetaxel and to reduce some other side effects (sickness and fluid retention). It's very important to take these tablets. If for some reason you haven't taken them, let your doctor or nurse know before you start your chemotherapy.
Your nurse will give you anti-sickness (anti-emetic) drugs before you start. TAC is then given through one of the following:
- a short thin tube that the nurse puts into a vein in your arm or hand (cannula)
- a fine tube that goes under the skin of your chest and into a vein close by (central line)
- a fine tube that is put into a vein in your arm and goes up into a vein in your chest (PICC line).
Your nurse will give you doxorubicin (a red fluid) and cyclophosphamide as slow injections directly into your vein, with a drip (infusion) to flush them through. Each should take 5 to 10 minutes.
Sometimes, cyclophosphamide is given as a drip over 30 minutes into your cannula or line. Then your nurse will give you docetaxel as a drip. The drips will go through a pump, which gives the treatment over an hour.
When the chemotherapy is being given
Some people might experience the following side effects while they are having the chemotherapy:
Docetaxel may cause an allergic reaction while it’s being given. Your nurse will check you for this. If you have a reaction, they will treat it quickly. Signs of a reaction can include:
- a rash
- feeling itchy, flushed or short of breath
- swelling of your face or lips
- feeling dizzy
- having pain in your tummy, back or chest
- feeling unwell.
Tell your nurse straight away if you have any of these symptoms.
The drug leaks outside the vein
If this happens when you’re having doxorubicin, it can damage the tissue around the vein. This is called extravasation. Tell the nurse straight away if you have any stinging, pain, redness or swelling around the vein. Extravasation is not common but if it happens it’s important that it’s dealt with quickly. If you get any of these symptoms after you get home, contact the doctor or nurse straight away on the number they gave you.
Flushes and blocked nose
Some people may have hot flushes, a feeling of having a blocked nose and a strange taste when cyclophosphamide is being given. This doesn’t last for long. But if you notice this, ask the nurse to slow down the drip, which will reduce these symptoms.
You may suddenly feel warm and your face may get red while the doxorubicin is being given. This should only last a few minutes.
Your course of TAC
You have chemotherapy as a course of several sessions (or cycles) of treatment over a few months. Each cycle of TAC takes 21 days (three weeks). On the first day, you have all three chemotherapy drugs. Then you will have no chemotherapy for the next 20 days.
At the end of the 21 days, you will start your second cycle of TAC. This is exactly the same as the first cycle. You will have up to six cycles of TAC. Your doctor or nurse will tell you how many cycles you are likely to have.
Your nurse or pharmacist will give you anti-sickness (anti-emetic) drugs to take at home. Take all your tablets exactly as explained.
Possible side effects of TACBack to top
We explain the most common side effects of TAC here. But we don’t include all the rare ones that are unlikely to affect you.
You may get some of the side effects we mention but you are very unlikely to get all of them. Always tell your doctor or nurse about the side effects you have.
Your doctor can prescribe drugs to help control some side effects. It is very important to take them exactly as your nurse or pharmacist has explained. This means they will be more likely to work better for you. Your nurse will give you advice about managing your side effects. After your treatment is over, the side effects will start to improve.
Serious and life-threatening side effects
Sometimes cancer drugs can result in very serious side effects, which rarely may be life-threatening. Your cancer doctor and nurse can explain the risk of these side effects to you.
Contact the hospital
Your nurse will give you telephone numbers for the hospital. You can call them if you feel unwell or need advice any time of day or night. Save these numbers in your phone or keep them somewhere safe.
More information about these drugs
We’re not able to list every side effect for this treatment here, particularly the rarer ones. For more detailed information you can visit the electronic Medicines Compendium (eMC).
Risk of infection
TAC can reduce the number of white blood cells in your blood. This will make you more likely to get an infection. When the number of white blood cells is low, it’s called neutropenia.
Contact the hospital straight away on the contact number you’ve been given if:
- your temperature goes over 37.5°C (99.5°F) or over 38°C (100.4°F), depending on the advice given by your chemotherapy team
- you suddenly feel unwell, even with a normal temperature
- you have symptoms of an infection – these can include feeling shaky, a sore throat, a cough, diarrhoea or needing to pass urine a lot.
The number of white blood cells usually increases steadily and returns to normal before your next treatment. You will have a blood test before having more chemotherapy. If your white blood cells are still low, your doctor may delay your treatment for a short time.
Your nurse may give you injections of a drug called G-CSF under the skin. It encourages the bone marrow (where blood cells are made) to make more white blood cells.
Bruising and bleeding
TAC can reduce the number of platelets in your blood. Platelets are cells that help the blood to clot. Tell your doctor if you have any bruising or bleeding you can’t explain. This includes nosebleeds, bleeding gums, blood spots or rashes on the skin. Some people may need a drip to give them extra platelets.
Anaemia (low number of red blood cells)
TAC can reduce the number of red blood cells in your blood. These cells carry oxygen around the body. If the number of red blood cells is low, you may be tired and breathless. Tell your doctor or nurse if you feel like this. If you are very anaemic, you may need a drip to give you extra red blood cells (blood transfusion).
Cyclophosphamide may irritate your bladder and cause discomfort when you pass urine. Drink at least two litres (three and a half pints) of fluids during the 24 hours following chemotherapy. It is also important to empty your bladder regularly and to try to pass urine as soon as you feel the need to go.
Contact the hospital straight away if you feel any discomfort or stinging when you pass urine, or if you notice any blood in it.
Your urine may be a pink-red colour for up to 48 hours after you’ve had your treatment. This is due to the colour of doxorubicin.
Build-up of fluid
You may put on weight or your ankles, legs and hands may swell because of fluid building up. The steroid tablets your doctor prescribes will help to prevent this. Tell your doctor or nurse if fluid builds up. If your ankles and legs swell it can help to put your legs up on a foot stool or cushion. The swelling gets better after your treatment ends.
This may happen in the first few days after chemotherapy. Your doctor will prescribe anti-sickness (anti-emetic) drugs to help prevent or control sickness. Take the drugs exactly as your nurse or pharmacist explains to you. It’s easier to prevent sickness than to treat it after it has started.
If you still feel sick or are vomiting, contact the hospital as soon as possible. They can give you advice and change the anti-sickness drug to one that works better for you.
Feeling very tired is a common side effect. It’s often worse towards the end of treatment and for some weeks after it’s finished. Try to pace yourself and get as much rest as you need. It helps to balance this with some gentle exercise, such as short walks. If you feel sleepy, don’t drive or operate machinery.
Your mouth may become sore and you may get ulcers. This can make you more likely to get an infection in your mouth. Gently clean your teeth and/or dentures morning and night and after meals. Use a soft-bristled or children’s toothbrush. Your nurse might ask you to rinse your mouth regularly or use mouthwashes. It’s important to follow any advice you are given and to drink plenty of fluids.
Tell your nurse or doctor if you have any problems with your mouth. They can prescribe medicines to prevent or treat mouth infections and reduce any soreness.
We have more information about mouth care during chemotherapy.
You may get a bitter or metallic taste in your mouth or find that food tastes different. This should go away when your treatment finishes. Try using herbs and spices (unless you have a sore mouth or ulcers) or strong-flavoured sauces to give your food more flavour. Sucking boiled sweets can sometimes help get rid of a bitter or metallic taste. Your nurse can give you more advice.
Loss of appetite
You may lose your appetite during your treatment. Try to eat small meals regularly. Don’t worry if you don’t eat much for a day or two. If your appetite doesn’t improve after a few days, let your nurse or dietitian know. They can give you advice on getting more calories and protein in your diet. They may give you food supplements or meal replacement drinks to try. Your doctor can prescribe some of these and you can buy them from chemists.
Your doctor can prescribe drugs to control diarrhoea. Let them know if it is severe or if it doesn’t get better. Make sure you drink at least two litres (three and a half pints) of fluids every day if you have diarrhoea.
TAC may make you constipated and cause tummy pain. Drinking at least two litres (three and a half pints) of fluids every day will help. Try to eat more foods that contain fibre (such as fruit, vegetables and wholemeal bread) and do some regular, gentle exercise.
You usually lose all the hair on your head. Your eyelashes, eyebrows and other body hair may also thin or fall out. This usually starts after your first or second cycle of chemotherapy. It is almost always temporary and your hair will grow back after chemotherapy ends, but rarely, the hair loss is permanent. It is important to cover your head to protect your scalp when you are out in the sun until your hair grows back. Your nurse can give you advice about coping with hair loss.
Scalp cooling is a way of lowering the temperature of the scalp to help reduce hair loss. Your nurse can tell you if this is an option for you.
Numb or tingling hands or feet
These symptoms are caused by the effect of docetaxel on nerves. It’s called peripheral neuropathy. You may also find it hard to fasten buttons or do other fiddly tasks.
Tell your doctor if you have these symptoms. They sometimes need to lower the dose of the drug. The symptoms usually improve slowly after treatment finishes, but in some people they may never go away. Talk to your doctor if you are worried about this.
TAC may affect your skin. Your doctor or nurse can tell you what to expect. If your skin feels dry, try using an unperfumed moisturising cream every day. During treatment and for several months afterwards, you'll be more sensitive to the sun and your skin may burn more easily than usual. You can still go out in the sun, but use a suncream with a sun protection factor (SPF) of at least 30, and cover up with clothing and a hat.
Your skin may darken. It will return to its normal colour after you finish treatment. If you’ve had radiotherapy, either recently or in the past, the area that was treated may become red or sore.
Always tell your doctor or nurse about any skin changes. They can give you advice and may prescribe creams or medicines to help. Any changes to your skin are usually temporary and improve when treatment finishes.
Your nails may become brittle and break easily. They may get darker or discoloured, and you may get lines or ridges on them. These changes usually grow out over several months after treatment finishes. Rarely, nails may come off, but they will grow back after treatment. Wearing gloves when washing dishes or using detergents will help protect your nails during treatment.
Changes in the way the kidneys and liver work
TAC can affect how your kidneys and liver work. This is usually mild and goes back to normal after treatment. You will have blood tests before chemotherapy to check how well your kidneys and liver are working.
Your eyes may become watery and feel sore. Your doctor can prescribe eye drops to help with this. If your eyes get red and inflamed (conjunctivitis), tell your doctor. This is because you may need antibiotic eye drops. Cyclophosphamide may also cause blurry vision and/or eye pain. Always tell your doctor or nurse if you have eye pain or notice any change in your vision.
Muscle and/or joint pain
You may get pain in your joints or muscles for a few days after chemotherapy. Tell your doctor if this happens so they can prescribe painkillers. Let them know if the pain does not get better. Try to get plenty of rest. Taking regular warm baths may help.
If this happens, let your doctor or nurse know. They can give you painkillers.
Less common side effects of TACBack to top
Changes in the way the heart works
Doxorubicin can affect the way the heart works. You may have tests to see how well your heart is working before, during and sometimes after treatment.
If you notice changes to your heartbeat, have pain or tightness in your chest, or feel breathless at any time during or after treatment, tell a doctor straight away. These symptoms can be caused by other conditions, but it’s important to get them checked by a doctor.
Effects on the lungs
TAC can cause changes to the lungs. Always tell your doctor if you develop wheezing, a cough, a fever or feel breathless. You should also let them know if any existing breathing problems get worse. If necessary, they can arrange for you to have tests to check your lungs.
Cyclophosphamide can increase the risk of developing a second cancer, usually leukaemia, years later. But the benefits of treatment usually far outweigh this risk. Your doctor can talk to you about this.
It’s important to let your doctor know straight away if you feel unwell or have any severe side effects, even if they’re not mentioned above.
Other information about TACBack to top
Blood clot risk
Cancer increases the chances of a blood clot (thrombosis) and chemotherapy can add to this. A clot can cause symptoms such as pain, redness and swelling in a leg, breathlessness and chest pain. Contact your doctor straight away if you have any of these symptoms. A blood clot is serious but your doctor can treat it with drugs that thin the blood. Your doctor or nurse can give you more information.
Some medicines can interact with chemotherapy or be harmful when you are having chemotherapy. This includes medicines you can buy in a shop or chemist. Tell your doctor about any medicines you are taking, including over-the-counter drugs, complementary therapies and herbal drugs.
Docetaxel contains alcohol. Tell your doctor, nurse or pharmacist if this is a problem for you. This treatment may affect your ability to drive or operate machinery.
TAC may affect your fertility (being able to get pregnant or father a child). If you are worried about this, you can talk to your doctor or nurse before treatment starts.
Changes to your periods
TAC can sometimes stop the ovaries working. You might not get a period every month and they may eventually stop. In some women this is temporary, but for others it is permanent and they start the menopause.
Your doctor will advise you not to become pregnant or to father a child during treatment. This is because the drugs may harm a developing baby. It’s important to use effective contraception during and for a few months after chemotherapy. You can talk to your doctor or nurse about this.
If you have sex within the first couple of days of having chemotherapy, you need to use a condom. This is to protect your partner in case there is any chemotherapy in your semen or vaginal fluid.
Women are advised not to breastfeed during treatment and for a few months after. This is in case there is chemotherapy in their breast milk.
Medical and dental treatment
If you need to go into hospital for any reason other than cancer, always tell the doctors and nurses that you are having chemotherapy. Give them the contact details for your cancer doctor.
Talk to your cancer doctor or nurse if you think you need dental treatment. Always tell your dentist you are having chemotherapy.
This page has been compiled using information from a number of reliable sources, including the electronic Medicines Compendium (eMC; medicines.org.uk). If you’d like further information on the sources we use, please feel free to contact us.
This information was reviewed by a medical professional.
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