Patient Leaflet Updated 16-Jul-2025 | Vertex Pharmaceuticals (Europe) Limited
Kaftrio 75 mg / 50 mg / 100 mg and 37.5 mg / 25 mg / 50 mg film-coated tablets
Kaftrio 37.5 mg/25 mg/50 mg film-coated tablets
Kaftrio 75 mg/50 mg/100 mg film-coated tablets
ivacaftor/tezacaftor/elexacaftor
1. What Kaftrio is and what it is used for
2. What you need to know before you take Kaftrio
3. How to take Kaftrio
4. Possible side effects
5. How to store Kaftrio
6. Contents of the pack and other information
Kaftrio contains three active substances: ivacaftor, tezacaftor and elexacaftor. The medicine helps lung cells to work better in some patients with cystic fibrosis (CF). CF is an inherited condition in which the lungs and the digestive system can become clogged with thick, sticky mucus.
Kaftrio taken with ivacaftor is for patients aged 6 years and over who have CF, with at least one F508del mutation in the CFTR (cystic fibrosis transmembrane conductance regulator) gene. Kaftrio is intended as a long-term treatment.
Kaftrio works on a protein called CFTR. The protein is damaged in some people with CF, if they have a mutation in the CFTR gene.
Kaftrio is normally taken with another medicine, ivacaftor. Ivacaftor causes the protein to work better, while tezacaftor and elexacaftor increase the amount of protein at the cell surface.
Kaftrio (taken with ivacaftor) helps your breathing by improving your lung function. You may also notice that you do not get ill as often, or that it is easier to gain weight.
Talk to your doctor and do not take the tablets, if this applies to you.
Tell your doctor right away if you have any symptoms of liver problems. These are listed in section 4.
Do not give this medicine to children under the age of 6 years because it is not known if Kaftrio is safe and effective in this age group.
Tell your doctor or pharmacist if you are taking, have recently taken, or might take any other medicines. Some medicines can affect how Kaftrio works or may make side effects more likely. In particular, tell your doctor if you take any of the medicines listed below. Your doctor may change the dose of one of the medicines if you take any of these.
Avoid food or drinks containing grapefruit during treatment as these may increase the side effects of Kaftrio by increasing the amount of Kaftrio in your body.
Kaftrio can make you dizzy. If you feel dizzy, do not drive, cycle, or use machines unless you are not affected.
This medicine contains less than 1 mmol sodium (23 mg) per dose, that is to say essentially “sodium-free”.
Always take this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.
There are different strengths of Kaftrio for different age groups. Check you have been given the right dose (below).
Kaftrio is usually taken with ivacaftor.
Age - 6 to <12 years, Weight - <30 kg, Morning dose - Two ivacaftor 37.5 mg/tezacaftor 25 mg/elexacaftor 50 mg tablets, Evening dose - One ivacaftor 75 mg tablet.
Age - 6 to <12 years, Weight - ≥30 kg, Morning dose - Two ivacaftor 75 mg/tezacaftor 50 mg/elexacaftor 100 mg tablets, Evening dose - One ivacaftor 150 mg tablet.
Age - ≥12 years, Morning dose - Two ivacaftor 75 mg/tezacaftor 50 mg/elexacaftor 100 mg tablets, Evening dose - One ivacaftor 150 mg tablet.
Take the morning and evening tablets about 12 hours apart.
The tablets are for oral use.
Take both Kaftrio and ivacaftor tablets with food that contains fat. Meals or snacks that contain fat include those prepared with butter or oils or those containing eggs. Other fat-containing foods are:
Avoid food and drink containing grapefruit while you are taking Kaftrio. See Kaftrio with food and drink in section 2 for more details.
Swallow the tablets whole. Do not chew, crush or break the tablets before swallowing.
You must keep using all your other medicines, unless your doctor tells you to stop.
If you have liver problems, either moderate or severe, your doctor may reduce the dose of your tablets or decide to stop treatment with Kaftrio. See also Warnings and precautions in section 2.
Contact your doctor or pharmacist for advice. If possible, take your medicine and this leaflet with you. You may get side effects, including those mentioned in section 4 below.
If you forget a dose, work out how long it is since the dose you missed.
Do not take a double dose to make up for any missed tablets.
Your doctor will tell you how long you need to keep taking Kaftrio. It is important to take this medicine regularly. Do not make changes unless your doctor tells you.
If you have any further questions on the use of this medicine, ask your doctor or pharmacist.
Like all medicines, this medicine can cause side effects, although not everybody gets them.
Possible signs of liver problems
Liver damage and worsening of liver function in people with severe liver disease. The worsening of liver function can be serious and may require transplantation.
Increased liver enzymes in the blood are very common in patients treated with Kaftrio. These may be signs of liver problems:
Tell your doctor straight away if you have any of these symptoms.
Very common side effects (may affect more than 1 in 10 people)
Tell your doctor straight away if you notice a rash.
Very common (may affect more than 1 in 10 people)
Common (may affect up to 1 in 10 people)
Uncommon (may affect up to 1 in 100 people)
Side effects in adolescents are similar to those observed in adults.
If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the:
or search for MHRA Yellow Card in the Google Play or Apple App Store.
By reporting side effects you can help provide more information on the safety of this medicine.
Keep this medicine out of the sight and reach of children.
Do not use this medicine after the expiry date which is stated on the outer carton and on the blister after EXP. The expiry date refers to the last day of that month.
This medicine does not require any special storage conditions.
Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help to protect the environment.
Kaftrio 37.5 mg/25 mg/50 mg film-coated tablets
Each film-coated tablet contains 37.5 mg of ivacaftor, 25 mg of tezacaftor and 50 mg elexacaftor.
Kaftrio 75 mg/50 mg/100 mg film-coated tablets
Each film-coated tablet contains 75 mg of ivacaftor, 50 mg of tezacaftor and 100 mg elexacaftor.
See the end of section 2 for important information about the contents of Kaftrio.
Kaftrio 37.5 mg/25 mg/50 mg film-coated tablets are light orange, capsule-shaped tablets stamped with “T50” on one side and plain on the other.
Kaftrio 75 mg/50 mg/100 mg film-coated tablets are orange, capsule-shaped tablets stamped with “T100” on one side and plain on the other.
Kaftrio is available in pack size of 56 tablets (4 blister cards, each with 14 tablets).
This leaflet was last revised in May 2025
Other sources of information
Detailed information on this medicine is available on the website of Medicines and Healthcare products Regulatory Agency: http://www.mhra.gov.uk.
2 Kingdom Street, London, W2 6BD, UK
0800 028 2616
0800 028 2616