If you or someone you love lives with cystic fibrosis, you already know the daily challenges it brings. Managing sticky mucus buildup takes time, effort, and careful daily planning. The good news is that medical research keeps moving forward to bring helpful new treatments to light.
Today we will look closely at a medicine called ivacaftor, often known by its brand name Kalydeco. This guide will walk you through what the medicine does, how to use it safely, and what side effects you might experience along the way.
Key Takeaways
- Ivacaftor is a targeted medicine for specific types of cystic fibrosis caused by certain genetic mutations.
- Always take your dose with fat-containing foods to help your body absorb the medicine properly.
- Never drink grapefruit juice or eat Seville oranges while taking this medicine.
- Tell your doctor about all your other medicines, vitamins, and health conditions before you start.
- Contact your doctor right away if you notice signs of liver issues or severe allergic reactions.
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What Does This Medicine Actually Do?
Simply put, ivacaftor is a prescription medicine used to treat cystic fibrosis. However, this medicine does not work for every single person with cystic fibrosis. It only helps people who carry specific genetic changes, known as specific mutations.
Your doctor will run specialized genetic tests to find out if ivacaftor is the right choice for your unique body. Cystic fibrosis is a genetic condition that harms the normal function of a specific protein in your body.
When this protein does not work right, thick and sticky mucus builds up in your lungs, pancreas, and other organs. This buildup can cause serious breathing problems and digestive challenges.
Ivacaftor works by helping that damaged protein do its job better. By improving the protein function, the thick mucus thins out so your body can clear it much more easily.
Things Your Doctor Must Know Before You Start
Before you take this medicine for the first time, giving your doctor a complete picture of your health is extremely important. Make sure to share these important details:
- Liver disease: Tell your doctor if you have any liver problems. Your body breaks down this medicine mainly through your liver, so liver issues might mean you need a different dose.
- Kidney disease: Let your doctor know if you have any kidney health issues or history of kidney trouble.
- Allergies: Share if you have ever had an allergic reaction to ivacaftor, any other medicines, foods, or dyes.
- Pregnancy plans: Tell your doctor if you are pregnant, think you might be pregnant, or plan to have a baby soon.
- Breastfeeding: Let your doctor know if you are currently breastfeeding or plan to breastfeed your baby.
How to Use This Medicine Correctly
To get the best results from your medicine, taking it exactly the way your doctor prescribes is vital.
How to Take Your Dose
You must always take this medicine with a meal that contains fat. For example, you can take your pill with an egg, cheese toast, a slice of bread with peanut butter, or an omelet cooked with butter.
Taking the medicine with fat helps your body absorb it properly. Never take your dose on an empty stomach.
Crucial Rule: Never take this medicine with grapefruit juice. You should also avoid Seville oranges. These foods can change how the medicine works in your body.
Take only the exact dose your doctor prescribes at the times they recommend. Never take extra medicine on your own, and do not stop taking it without talking to your doctor first.
Giving This Medicine to Children
Doctors sometimes prescribe this medicine for children who are six years old and older. If you are giving this medicine to a child, talk closely with your pediatrician and follow their instructions carefully.
What to Do in Case of an Overdose
If you think you have taken more medicine than you should have, get help right away. Call your local emergency services, such as 911 in the US or 999 in the UK, or go straight to the nearest emergency department.
What to Do If You Miss a Dose
If you miss a scheduled dose, take it as soon as you remember. However, if it is almost time for your next regular dose, skip the missed dose completely.
Simply take your next dose at the normal scheduled time. Never take a double dose to make up for a missed one.
Other Medicines That May Interact With Ivacaftor
Tell your doctor about every medicine you use, including vitamins and herbal products. Some products can interact with ivacaftor and change how it works. Review the table below to see common examples.
| Medicine or Substance Category | What Happens and Why |
|---|---|
| Medicines to Avoid Completely | |
| Certain seizure medicines (carbamazepine, phenobarbital, phenytoin) | These can greatly lower the effectiveness of ivacaftor in your body. |
| Grapefruit juice and Seville oranges | These can raise the level of medicine in your blood to unsafe amounts. |
| Rifampin and rifabutin (tuberculosis treatments) | These can make ivacaftor stop working properly. |
| St. John's Wort (herbal supplement) | This herbal product can reduce ivacaftor levels in your system. |
| Medicines Requiring Close Doctor Supervision | |
| Antifungal medicines (ketoconazole, itraconazole, fluconazole) | These can increase ivacaftor levels and raise the risk of side effects. |
| Certain antibiotics (clarithromycin, erythromycin) | These can also increase the amount of ivacaftor in your body. |
| Cyclosporine, tacrolimus, and digoxin | Ivacaftor can alter how these specific medicines work in your system. |
This list does not include every possible interaction. Always share a complete list of your current products with your doctor and pharmacist.
Possible Side Effects While Taking This Medicine
Like all medicines, ivacaftor can cause side effects. Some effects are mild. This others need quick medical attention.
| Side Effect Type | What to Look For and Do |
|---|---|
| Serious Warning Signs | Watch for allergic signs like skin rashes, itching, or swelling of your face, lips, and tongue. Also watch for liver issues like dark urine, light stools, yellow skin or eyes, upper right belly pain, or loss of appetite. Report any blurry vision or unusual tiredness right away. |
| Common Mild Effects | You might experience mild upset stomach, nausea, or diarrhea. Headaches, dizziness, and joint pain can also happen. If these mild symptoms do not go away, let your doctor know. |
Your doctor may need to check your eyesight and order routine blood tests to check your liver enzymes while you take this medicine. These routine checks are a normal part of your care.
How to Store Your Medicine Safely
Keep these simple storage tips in mind to protect your medicine:
- Keep all medicines safely stored away and out of the reach of children.
- Store your pills at room temperature, ideally between 15°C and 30°C (59°F to 86°F).
- Safely throw away any medicine that has passed its expiration date.
This medicine is prescribed specifically for you. Never share your pills with anyone else, even if they have similar symptoms.
When to Seek Emergency Help
If you experience sudden severe shortness of breath, severe chest pain, or signs of a serious allergic reaction like facial swelling or trouble breathing, call 911 (US) or 999 (UK) right away, or go to the nearest emergency department right away.
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