Safety & Side Effects

KALYDECO is for people with cystic fibrosis (CF) age 12 months and older with at least 1 mutation in their CF gene responsive to KALYDECO. It is not known if KALYDECO is safe and effective in younger children.

How the safety of KALYDECO® was assessed in clinical studies

The overall safety profile of KALYDECO is based on data from 3 placebo-controlled studies. The safety data from the 3 clinical studies were combined and reviewed together, or "pooled," to arrive at the safety profile for KALYDECO.

Across these studies, a total of 353 people 6 years of age and older with the G551D mutation (Studies 1 and 2) or 2 copies of the F508del* mutation (Study 3) in their CFTR gene took KALYDECO or placebo every 12 hours with fat-containing food. 221 people received KALYDECO and 132 people received placebo.

*KALYDECO is not approved and is not effective in people with CF with two copies of the F508del mutation (F508del/F508del) in the CF gene.

In addition, safety was assessed in the following clinical studies:

  • Study 4: Study of KALYDECO in 39 people with CF age 6 years and older with a G1244E, G1349D, G178R, G551S, G970R, S1251N, S1255P, S549N, or S549R mutation. People in the study took either KALYDECO (150 mg tablets) or placebo every 12 hours with fat-containing food. Each person had an 8-week treatment period with KALYDECO and an 8-week treatment period with placebo
    KALYDECO is not indicated for people with CF who have the G970R mutation.
  • Study 5: A 24-week study in which KALYDECO was studied in 69 people with CF age 6 years and older with an R117H mutation. People in the study took either KALYDECO (150 mg tablets) or placebo every 12 hours with fat-containing food
  • Study 6: A 24-week study in which KALYDECO was studied in 34 children with CF age 2 to less than 6 years with a G551D or S549N mutation. All children in this study took KALYDECO (50 mg or 75 mg oral granules) every 12 hours with fat-containing food. No one in this study took placebo
  • Study 7: An 8-week study in which KALYDECO was studied in people with CF age 12 years and older with 1 copy of the F508del mutation and a 2789+5G→A, 3272-26A→G, 3849+10kbC→T, 711+3A→G, A455E, D1152H, D579G, E831X, L206W, P67L, R1070W, R117C, R347H, R352Q, S945L, or S977F mutation. In this study, 156 people took KALYDECO (150 mg tablets) and 161 people took placebo every 12 hours with fat-containing food
  • Study 8: A 24-week study in which KALYDECO was studied in 19 children with CF age 12 months to less than 2 years with a G178R, G551D, or S549N mutation. All children in this study took KALYDECO (50 mg or 75 mg oral granules) every 12 hours with fat-containing food. No one in this study took placebo

The safety profile for Studies 4, 5, 6, 7, and 8 was similar to that observed in Studies 1 and 2.

Remember, this website is for informational purposes only and is not intended to be a substitute for professional medical advice. You should talk to your healthcare provider about the clinical study results and the possible side effects of KALYDECO.

What are the possible side effects of KALYDECO?

exclamation mark

KALYDECO can cause serious side effects

liver

High liver enzymes in the blood have been reported in patients receiving KALYDECO

CalenderIcon

Your doctor will do blood tests to check your liver:

  • before you start KALYDECO
  • every 3 months during your first year of taking KALYDECO
  • every year while you are taking KALYDECO
liver

For patients who have had high liver enzymes in the past, the doctor may do blood tests to check the liver more often

Call your doctor right away if you have any of the following symptoms of liver problems:

  • pain or discomfort in the upper right stomach (abdominal) area
  • yellowing of your skin or the white part of your eyes
  • loss of appetite
  • nausea or vomiting
  • dark, amber-colored urine
cataracts

Abnormality of the eye lens (cataract) has been noted in some children and adolescents receiving KALYDECO. Your doctor should perform eye examinations prior to and during treatment with KALYDECO to look for cataracts

The most common side effects include

person with a headache
  • headache
person holding box of tissues
  • upper respiratory tract infection (common cold), including
    • sore throat
    • nasal or sinus congestion
    • runny nose
stomach pains
  • stomach (abdominal) pain
  • diarrhea
person with a rash
  • rash
person who is dizzy
  • nausea
  • dizziness
talk to your healthcare provider

Tell your doctor if you have any side effect that bothers you or that does not go away. These are not all the possible side effects of KALYDECO. For more information, ask your doctor or pharmacist.

What is KALYDECO® (ivacaftor)?

KALYDECO is a prescription medicine used for the treatment of cystic fibrosis (CF) in patients age 12 months and older who have at least one mutation in their CF gene that is responsive to KALYDECO.

Talk to your doctor to learn if you have an indicated CF gene mutation.

It is not known if KALYDECO is safe and effective in children under 12 months of age.

EXPAND

Important Safety Information

Who should not take KALYDECO?

Do not take KALYDECO if you take certain medicines or herbal supplements, such as:

  • the antibiotics rifampin (Rifamate®, Rifater®) or rifabutin (Mycobutin®)
  • seizure medicines such as phenobarbital, carbamazepine (Tegretol®, Carbatrol®, and Equetro®), or phenytoin (Dilantin®, Phenytek®)
  • St. John’s wort (Hypericum perforatum)

Talk to your doctor before taking KALYDECO if you take any of the medicines or supplements listed above.

EXPAND

What is KALYDECO® (ivacaftor)?

KALYDECO is a prescription medicine used for the treatment of cystic fibrosis (CF) in patients age 12 months and older who have at least one mutation in their CF gene that is responsive to KALYDECO.

Talk to your doctor to learn if you have an indicated CF gene mutation.

It is not known if KALYDECO is safe and effective in children under 12 months of age.

Important Safety Information

Who should not take KALYDECO?

Do not take KALYDECO if you take certain medicines or herbal supplements, such as:

  • the antibiotics rifampin (Rifamate®, Rifater®) or rifabutin (Mycobutin®)
  • seizure medicines such as phenobarbital, carbamazepine (Tegretol®, Carbatrol®, and Equetro®), or phenytoin (Dilantin®, Phenytek®)
  • St. John’s wort (Hypericum perforatum)

Talk to your doctor before taking KALYDECO if you take any of the medicines or supplements listed above.

What should I tell my doctor before taking KALYDECO?

Before you take KALYDECO, tell your doctor if you:

  • have liver or kidney problems
  • drink grapefruit juice, or eat grapefruit or Seville oranges
  • are pregnant or plan to become pregnant. It is not known if KALYDECO will harm your unborn baby. You and your doctor should decide if you will take KALYDECO while you are pregnant
  • are breastfeeding or planning to breastfeed. It is not known if KALYDECO passes into your breast milk. You and your doctor should decide if you will take KALYDECO while you are breastfeeding

KALYDECO may affect the way other medicines work, and other medicines may affect how KALYDECO works.

Tell your doctor about all the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements, as the dose of KALYDECO may need to be adjusted when taken with certain medications.

Especially tell your doctor if you take:

  • antifungal medications such as ketoconazole (e.g., Nizoral®), itraconazole (e.g., Sporanox®), posaconazole (e.g., Noxafil®), voriconazole (e.g., Vfend®), or fluconazole (e.g., Diflucan®)
  • antibiotics such as telithromycin (e.g., Ketek®), clarithromycin (e.g., Biaxin®), or erythromycin (e.g., Ery-Tab®)

What should I avoid while taking KALYDECO?

  • KALYDECO can cause dizziness in some people who take it. Do not drive a car, use machinery, or do anything that needs you to be alert until you know how KALYDECO affects you
  • You should avoid food containing grapefruit or Seville oranges while you are taking KALYDECO

What are the possible side effects of KALYDECO?

KALYDECO can cause serious side effects.

High liver enzymes in the blood have been reported in patients receiving KALYDECO. Your doctor will do blood tests to check your liver:

  • before you start KALYDECO
  • every 3 months during your first year of taking KALYDECO
  • every year while you are taking KALYDECO

For patients who have had high liver enzymes in the past, the doctor may do blood tests to check the liver more often.

Call your doctor right away if you have any of the following symptoms of liver problems:

  • pain or discomfort in the upper right stomach (abdominal) area
  • yellowing of your skin or the white part of your eyes
  • loss of appetite
  • nausea or vomiting
  • dark, amber-colored urine

Abnormality of the eye lens (cataract) has been noted in some children and adolescents receiving KALYDECO. Your doctor should perform eye examinations prior to and during treatment with KALYDECO to look for cataracts.

The most common side effects include:

  • headache
  • upper respiratory tract infection (common cold), including sore throat, nasal or sinus congestion, runny nose
  • stomach (abdominal) pain
  • diarrhea
  • rash
  • nausea
  • dizziness

Tell your doctor if you have any side effect that bothers you or that does not go away. These are not all the possible side effects of KALYDECO. For more information, ask your doctor or pharmacist.

Call your doctor for medical advice about side effects. You are encouraged to report side effects to FDA at 1-800-FDA-1088.

Click here for KALYDECO full Prescribing Information, including Patient Information.