Drug & supplement interaction

Isatis + Tezacaftor, Ivacaftor

Tezacaftor, Ivacaftor brand name: Symdeko.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Isatis and Tezacaftor, Ivacaftor in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.

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Interaction report

Isatis and Tezacaftor, Ivacaftor

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Tezacaftor, Ivacaftor and Isatis in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

Worth understanding: our licensed dataset holds no drug-interaction record for Isatis at all — not against Tezacaftor, Ivacaftor, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Isatis safety at a glance

Isatis overall Use caution Generally used short-term in traditional medicine, but human safety data are limited.
Pregnancy Avoid Not enough safety information, so it is best avoided during pregnancy.
Breastfeeding Avoid There is no reliable safety data, so avoid while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Tezacaftor, Ivacaftor and Isatis? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Tezacaftor, Ivacaftor’s Own FDA Label Lists

This is not an interaction — none of it involves Isatis. These are the most notable effects listed in the ADVERSE REACTIONS section of Tezacaftor, Ivacaftor’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both. 7 of them are worth acting on rather than waiting out — marked below.

  • Thoughts of self-harm Worth acting on
  • A bowel blockage Worth acting on
  • Low mood Worth acting on
  • Raised blood pressure Worth acting on
  • A severe allergic reaction Worth acting on
  • A higher chance of infection Worth acting on
  • An allergic reaction Worth acting on
  • A stuffy or runny nose
  • Anxiety or restlessness
  • Trouble sleeping

Showing the 10 most notable of 14 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Tezacaftor, Ivacaftor. Read the label on DailyMed › Isatis’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Isatis side to compare — that is a limit of the record, not a statement that Isatis has no side effects.

Everything else you take

See Every Supplement That Interacts With Tezacaftor, Ivacaftor

This page covers Isatis only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Tezacaftor, Ivacaftor page lists 138 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), St. John's Wort (major), Acacia Rigidula (moderate) and Adrafinil (moderate).

By severity: 3 major · 94 moderate · 41 minor.

From our pharmacist’s overview on the Tezacaftor, Ivacaftor page

“Symdeko (tezacaftor and ivacaftor) treats cystic fibrosis and depends on a steady blood level, which is exactly what most of this list can upset, so it deserves genuine attention. The great majority of these ingredients act on CYP3A4, the liver enzyme that clears the drug.”

Reviewed by 2 · Jul 18, 2026

Open the Tezacaftor, Ivacaftor interaction page

One more smart check

Taking Isatis as Part of a Dietary Supplement Product? Check It for Interactions

We hold 413 real supplement products containing Isatis, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Isatis. Even though Isatis itself has no known interaction with Tezacaftor, Ivacaftor, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Isatis and Tezacaftor, Ivacaftor Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Isatis
Top 25%

#294 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Tezacaftor, Ivacaftor
Steady interest

#1,426 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions. Isatis is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Isatis reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Isatis and Tezacaftor, Ivacaftor records this page draws on were last updated June 22, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Isatis

What is Isatis?

  • Colds and flu-like illness
  • Sore throat
  • Fever
  • Immune support
  • Antiviral and antimicrobial support

Isatis is a plant long used in traditional Chinese medicine, mainly for sore throats, fevers, and colds. Modern evidence in people is very limited, so its benefits are not well proven. Talk with your pharmacist or doctor before using it, and avoid it during pregnancy and breastfeeding.

Isatis tinctoria · Brassicaceae · Root (Ban Lan Gen) and leaf (Da Qing Ye) · Capsules, tablets, granules, powders, teas, and tinctures

An interaction check asks whether these two react with each other — it does not ask whether Isatis is a good idea for someone in your situation. Here is what our Isatis record says about it on its own.

Isatis: dosing

There is no well-established standard dose for Isatis. Traditional preparations and modern products vary widely in strength and form.If you choose to use it, follow the directions on the product label and do not exceed the recommended amount. A pharmacist or qualified healthcare provider can help you decide whether it is appropriate for you and review your other medicines and health conditions first.

From our Isatis monograph — the full record covers uses, side effects and every documented interaction.

Read the full Isatis monograph & all interactions
Medication

About Tezacaftor and Ivacaftor

What Is Tezacaftor and Ivacaftor Used For?

Brand name: Symdeko

SYMDEKO is used to treat cystic fibrosis (CF) in patients aged 6 years and older. It is approved for people who have two copies of the F508del mutation, or who have at least one mutation in the CFTR gene that lab data or clinical evidence shows will respond to this combination.

Because not every CF mutation responds to SYMDEKO, a genetic test may be needed to confirm the right mutation is present before starting treatment.

See full Tezacaftor and Ivacaftor drug information
Keep checking

Other Drugs & Isatis

Browse every other medication we’ve checked against Isatis — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

We also checked Isatis against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Isatis list.

See the full Isatis interactions page
See every supplement checked against Tezacaftor, Ivacaftor, ranked by severity
Evidence & sources

Isatis References

The 3 sources that drive our Isatis monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Isatis is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. Herbs at a Glance — NIH NCCIH Source
  2. Herbs and Supplements — MedlinePlus Source
  3. About Herbs, Botanicals & Other Products — Memorial Sloan Kettering Cancer Center Source

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Isatis and Tezacaftor, Ivacaftor Together: Common Questions

Is it safe to take Isatis with Tezacaftor, Ivacaftor?
We do not list a known interaction between Isatis and Tezacaftor, Ivacaftor. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Does Tezacaftor, Ivacaftor interact with any supplements?
Yes. Tezacaftor, Ivacaftor has documented interactions with 138 supplements in our database — Isatis is not one of them. The Tezacaftor, Ivacaftor interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

Isatis monograph Uses, safety profile, and every drug interaction in one place Tezacaftor and Ivacaftor drug information The full plain-English guide to this medication Tezacaftor, Ivacaftor supplement interactions Every supplement checked against Tezacaftor, Ivacaftor, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 3 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Tezacaftor, Ivacaftor and Isatis?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.