May 28, 2017
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(ivacaftor) Film-coated Tablets


The active ingredient in KALYDECO tablets is ivacaftor, which has the following chemical name: N-(2,4-di-tert-butyl-5-hydroxyphenyl)-1,4-dihydro-4oxoquinoline-3-carboxamide. Its molecular formula is C24H28N2O3 and its molecular weight is 392.49. Ivacaftor has the following structural formula:

KALYDECO® (ivacaftor) Structural Formula Illustration

Ivacaftor is a white to off-white powder that is practically insoluble in water ( < 0.05 microgram/mL). KALYDECO is available as a light blue capsule-shaped, film-coated tablet for oral administration containing 150 mg of ivacaftor. Each tablet contains the inactive ingredients colloidal silicon dioxide, croscarmellose sodium, hypromellose acetate succinate, lactose monohydrate, magnesium stearate, microcrystalline cellulose, and sodium lauryl sulfate. The tablet film coat contains carnauba wax, FD&C Blue #2, PEG 3350, polyvinyl alcohol, talc, and titanium dioxide. The printing ink contains ammonium hydroxide, iron oxide black, propylene glycol, and shellac.

What are the possible side effects of ivacaftor (Kalydeco)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have a serious side effect such as:

  • severe stomach pain;
  • chest pain, wheezing, feeling short of breath;
  • nausea, upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes); or
  • low blood sugar (headache, hunger, weakness, sweating, confusion, irritability, dizziness, fast heart rate, or feeling...

Read All Potential Side Effects and See Pictures of Kalydeco »

Last reviewed on RxList: 11/18/2016
This monograph has been modified to include the generic and brand name in many instances.

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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