Have you or a loved one been diagnosed with cystic fibrosis? If so, your doctor may have prescribed a combination tablet containing tezacaftor and ivacaftor. You might also know this medicine by its brand name, Symdeko. This is a special type of medicine designed to target the root cause of your symptoms. Let us explore what this medicine does, how to use it safely, and what side effects to watch for.
Navigating a new treatment plan can feel overwhelming at first. Understanding how your medicine works helps you take an active role in your health care. This guide breaks down everything you need to know in simple, clear language.
Key Takeaways
- Tezacaftor and ivacaftor work together to help salt and water move correctly in your body cells.
- Always take your tablets with a fat-containing meal to ensure your body absorbs the medicine properly.
- Never eat grapefruit or grapefruit juice while taking this medicine, as it changes how your body processes the drug.
- Keep all scheduled doctor visits and blood tests to monitor your liver health and treatment progress safely.
- Contact your doctor right away if you notice vision changes, yellowing of your skin or eyes, or severe allergic reactions.
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What Does This Medicine Actually Do?
Cystic fibrosis is a genetic condition that affects how your body handles salt and water balance. Because of this genetic change, fluids in your body—especially in your lungs and digestive system—become very thick and sticky. This sticky mucus makes breathing difficult and can lead to frequent lung infections.
Think of your body cells as having tiny microscopic doors that let salt and water move in and out. In cystic fibrosis, these doors do not work the way they should. This is where tezacaftor and ivacaftor come in to help.
These two medicines target the faulty protein doors and help them work correctly. Once salt and water flow normally again, the thick mucus thins out and clears more easily from your lungs. Breathing becomes much easier, and your daily symptoms stay under better control.
Things to Tell Your Doctor Before Starting
Before you take your first dose, sharing your complete health history with your doctor is extremely important. Certain health conditions require extra caution when using this medicine. Make sure to mention the following details:
- If you have any kind of kidney disease or kidney problems.
- If you have any liver disease, since your liver processes and removes this medicine from your body.
- If you have known allergies to tezacaftor, ivacaftor, or any other medicines, foods, or dyes.
- If you are pregnant, planning to become pregnant, or trying to start a family.
- If you are currently breastfeeding your baby.
Your doctor uses this important information to decide if this medicine is safe for you or if your dose needs any adjustments.
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Getting the best results from your treatment depends on taking your medicine correctly every single day.
- Take with fat-containing food: Swallow your tablet with a meal or snack that contains fat. Good options include eggs, peanut butter, cheese, whole milk, yogurt, or food prepared with healthy oils. Taking it with fat helps your body absorb the medicine.
- Stick to a schedule: Try to take your doses at the same times every day. Keep about a 12-hour gap between your morning and evening doses.
- Swallow whole: Do not crush, chew, or break the tablet. Swallow it whole with a full glass of water. The tablet is specially designed to release medicine slowly inside your body.
- Avoid grapefruit completely: Never eat grapefruit or drink grapefruit juice while taking this medicine. It causes serious changes in how your medicine works.
- Do not stop early: Keep taking your medicine unless your doctor tells you to stop, even if you feel completely healthy.
What to Do If You Take Too Much
If you accidentally take more medicine than prescribed, do not wait. Go right away to the nearest hospital Emergency Department (ER) or call emergency services at 911 (US/Canada) or 999 (UK). You can also contact your local poison control center right away for expert guidance.
What to Do If You Miss a Dose
Suppose you forgot to take your morning dose at 8:00 AM and remember around 12:00 PM. If there are more than 6 hours left before your next scheduled dose, take the missed dose right away. However, if your next dose is less than 6 hours away, skip the missed dose completely and stick to your regular schedule.
Never take two doses at the same time to make up for a missed one.
Other Medicines That May Interact With This Treatment
This medicine can interact with several other drugs. Sharing a complete list of everything you take—including vitamins, herbal supplements, and over-the-counter products—with your doctor is essential.
| Medicine or Substance Category | Examples |
|---|---|
| Avoid These Completely While Taking This Medicine | |
| Certain seizure medicines | Carbamazepine, Phenobarbital, Phenytoin |
| Certain tuberculosis medicines | Rifampin, Rifabutin |
| Herbal supplements | St. John's Wort |
| Food and drink | Grapefruit and grapefruit juice |
| Inform Your Doctor If You Take These (May Require Dose Adjustments) | |
| Certain antibiotics | Clarithromycin, Erythromycin |
| Antifungal medicines | Fluconazole, Itraconazole, Ketoconazole |
| Immunosuppressants | Cyclosporine, Sirolimus, Tacrolimus |
| Heart rhythm medicines | Digoxin |
This list does not cover every possible interaction. Always check with your doctor or pharmacist before starting any new product.
Things to Watch While Taking Your Medicine
Your doctor will monitor your health closely throughout your treatment course to ensure everything goes smoothly.
- Regular clinic visits: Attend all scheduled appointments so your care team can track how well your treatment works and adjust your care plan if needed.
- Routine blood tests: Your doctor will order blood tests to check your liver enzymes. This is a normal safety step that ensures your liver handles the medicine without irritation.
- Eye exams: Your doctor may recommend an eye examination before and during treatment. Report any vision changes—such as blurry vision or seeing halos around lights—to your doctor right away.
Possible Side Effects to Know
Like all medicines, this combination can cause side effects, though not everyone experiences them. Knowing what to watch for helps you respond quickly if issues arise.
| Side Effect Category | Signs and Symptoms |
|---|---|
| Serious Side Effects (Contact Your Doctor Right away) | |
| Allergic reactions | Skin rash, itching, swelling of the face, lips, tongue, or throat, and trouble breathing. |
| Liver injury signs | Pain in the upper right side of your belly, loss of appetite, nausea, pale stools, dark urine, yellowing of your skin or eyes, and unusual tiredness. |
| Vision changes | Blurry vision, halos around bright lights, or any sudden loss of sight. |
| Common Mild Side Effects (Usually Pass Over Time) | |
| Headache | Mild to moderate head pain. |
| Dizziness | Feeling unsteady or lightheaded. |
| Nausea | A mild sick feeling in your stomach. |
| Sinus discomfort | Pressure or pain around your forehead, nose, and cheeks. |
If you experience any unusual symptoms not listed here, reach out to your doctor for guidance.
How to Store Your Medicine Safely
- Keep away from children: Store all medicines in a secure, locked place out of the reach of children and family pets.
- Control temperature: Keep your tablets at room temperature between 20°C and 25°C (68°F to 77°F). Protect them from excessive heat and moisture.
- Check expiration dates: Never take medicine past its expiration date printed on the packaging.
- Dispose properly: Do not flush unused tablets down the toilet or throw them into household trash without checking. Ask your pharmacist or local doctor for safe disposal instructions.
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