Medication interaction hub

What Supplements Interact with Fexofenadine?

Fexofenadine brand name: Allegra. Every interaction below applies to the brands too.

154 Interactions 5 Major 111 Moderate 38 Minor
Curated & coded by · Clinical Pharmacist · Updated September 22, 2026

Drug–supplement interaction data sourced from Natural Medicines Pro, the licensed clinical database from TRC Healthcare / Therapeutic Research, with additional analysis by the HelloPharmacist Pharmacist Team. Our sources · Editorial policy

What is this page for?

One answer, for one medication: what supplements and herbal products interact with Fexofenadine? Every vitamin, herb, and supplement ingredient we’ve checked against it is on this page, ranked by severity, each linking to the full report for that exact pair.

This page covers supplement interactions only — to check Fexofenadine against your other medications, use the drug–drug interaction checker. Educational information from our licensed clinical databases, not medical advice. Our editorial policy

HelloPharmacist Bottom Line
Our Pharmacist Explains
What is this? The interaction data in the HelloPharmacist supplement database is licensed from Natural Medicines Pro by TRC Healthcare (Therapeutic Research). HelloPharmacist pharmacists often add our own analysis and context on top of that licensed data — such as this Bottom Line summary and the notes on individual interaction pages — and any such commentary is noted as ours.

An over-the-counter allergy pill sounds like the last place serious interactions would hide, but fexofenadine (Allegra) has 154 supplements and foods on file, and the five rated major deserve real attention before you combine it with much of anything else. Two of those five sit in most refrigerators. Apple and orange juice block the gut transporter that moves fexofenadine into your bloodstream, so a glass near your dose can sharply cut how much medicine you actually absorb.

St. John's wort, another major entry, works the opposite way, speeding up drug metabolism so you may get less allergy relief. Most of the 111 moderate entries repeat these same mechanisms with less force, herbs nudging drug levels up or down through liver enzymes and transport proteins, while a few binding agents simply soak up oral medicines in the gut. The 38 minor entries carry less weight. Keep juices and binders well apart from your dose, and read the five major entries first.

— , Clinical Pharmacist · July 18, 2026

Major 5 Moderate 111 Minor 38 No known interaction 1,298

This box checks one ingredient at a time (like turmeric or magnesium). Taking a supplement product with a whole label of ingredients? Search the product instead — we check every ingredient on it ↓

Most Viewed Ingredient Interactions

Fexofenadine: Top Interactions at a Glance

The Fexofenadine supplement & herbal interactions people checked most in the last 24 hours, colored by severity. Tap any ingredient to open the full report for that pair.

Showing the 12 highest-ranked of 154 interacting ingredients — plus 1,298 more checked with no known interaction. See the complete ranked list.

Start here

The Most-Checked Fexofenadine Combinations Today

The Fexofenadine + supplement pages people viewed most in the last 24 hours (resets at midnight). Open any card for the full report.

Major Likelihood Likely Apple + Fexofenadinei

Concomitant consumption of apple juice can significantly decrease oral absorption and blood levels of OATP substrates.

Read the full interaction Major Likelihood Probable St. John's Wort + Fexofenadinei

St.

Read the full interaction Minor Likelihood Possible Black Cohosh + Fexofenadinei

Black cohosh may inhibit one form of OATP, OATP2B1, which could reduce the bioavailability and clinical effects of OATP2B1 substrates.

Read the full interaction Minor Likelihood Possible Ashwagandha + Fexofenadinei

Theoretically, ashwagandha might decrease the levels and clinical effects of CYP3A4 substrates.

Read the full interaction Major Likelihood Likely Grapefruit + Fexofenadinei

Grapefruit juice can increase levels of drugs metabolized by CYP3A4.

Read the full interaction Moderate Likelihood Possible Melatonin + Fexofenadinei

Theoretically, taking melatonin with drugs that lower the seizure threshold might increase the risk of seizure activity.

Read the full interaction
The complete list

Every Supplement Checked Against Fexofenadine

All 1,452 ingredients in our database, ranked by severity — 154 with a Fexofenadine interaction on file and 1,298 with none found. Filter by severity or search any ingredient; hover the for what each ingredient is.

Looking for an interaction with a specific supplement product? Search products instead ↓

Straight answers

Can You Take It With Fexofenadine?

One-line answers, one card per combination — scroll through today’s 20 and tap any card for the full report. A different set rotates in daily until every combination has had its turn.

Can you take Apple with Fexofenadine?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Concomitant consumption of apple juice can significantly decrease oral absorption and blood levels of OATP substrates.

Full Apple + Fexofenadine answer

Can you take St. John's Wort with Fexofenadine?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. St.

Full St. John's Wort + Fexofenadine answer

Can you take Black Cohosh with Fexofenadine?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Black cohosh may inhibit one form of OATP, OATP2B1, which could reduce the bioavailability and clinical effects of OATP2B1 substrates.

Full Black Cohosh + Fexofenadine answer

Can you take Ashwagandha with Fexofenadine?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, ashwagandha might decrease the levels and clinical effects of CYP3A4 substrates.

Full Ashwagandha + Fexofenadine answer

Can you take Grapefruit with Fexofenadine?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Grapefruit juice can increase levels of drugs metabolized by CYP3A4.

Full Grapefruit + Fexofenadine answer

Can you take Peppermint with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, peppermint might increase the levels of CYP3A4 substrates.

Full Peppermint + Fexofenadine answer

Can you take Phellodendron with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, phellodendron might increase serum levels of drugs metabolized by CYP3A4.

Full Phellodendron + Fexofenadine answer

Can you take Propolis with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, high doses of propolis might increase blood levels of drugs metabolized by CYP3A4.

Full Propolis + Fexofenadine answer

Can you take Quercetin with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, concomitant use might alter the effects and adverse effects of CYP3A4 substrates.

Full Quercetin + Fexofenadine answer

Can you take Rabdosia Rubescens with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. In vitro research shows that oridonin, a constituent of Rabdosia rubescens, induces cytochrome P450 3A4 (CYP3A4) enzyme.

Full Rabdosia Rubescens + Fexofenadine answer

Can you take Rauwolscine with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking rauwolscine with seizure threshold lowering drugs might increase the risk of adverse convulsant effects.

Full Rauwolscine + Fexofenadine answer

Can you take Resveratrol with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, resveratrol might increase levels of drugs metabolized by CYP3A4.

Full Resveratrol + Fexofenadine answer

Can you take Rhodiola with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, rhodiola might increase levels of P-glycoprotein substrates.

Full Rhodiola + Fexofenadine answer

Can you take Rooibos with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking rooibos with CYP3A4 substrates may increase the effects of CYP3A4 substrates.

Full Rooibos + Fexofenadine answer

Can you take Sage with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, sage might increase the levels and clinical effects of drugs metabolized by CYP3A4.

Full Sage + Fexofenadine answer

Can you take Schizonepeta with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Animal research suggests that schizonepetin, a monoterpene constituent of schizonepeta, induces cytochrome P450 (CYP) 3A4.

Full Schizonepeta + Fexofenadine answer

Can you take Slippery Elm with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, slippery elm may slow the absorption and reduce serum levels of oral drugs.

Full Slippery Elm + Fexofenadine answer

Can you take Strawberry with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. In vitro research suggests that strawberry extract can inhibit p-glycoprotein efflux.

Full Strawberry + Fexofenadine answer

Can you take Sulforaphane with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, sulforaphane might increase the levels and effects of CYP3A4 substrates.

Full Sulforaphane + Fexofenadine answer

Can you take Sweet Annie with Fexofenadine?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Sweet Annie may alter plasma levels and clinical effects of drugs metabolized by CYP3A4.

Full Sweet Annie + Fexofenadine answer
Read the list like a pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each entry links to a full report with the clinical detail, likelihood, evidence level, and citations for that exact combination.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

How Does Our Interaction Checker Work?

Behind every verdict on this page is a category system. Our source database doesn’t document supplement interactions drug-by-drug — it documents them against groups of medications that behave the same way (for example, “drugs processed by the CYP3A4 liver enzyme” or “blood-thinning medications”).

So the check works in three steps: (1) Fexofenadine is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Fexofenadine, and (3) each ingredient keeps its own severity, likelihood, and evidence grades from the underlying record. That’s why one supplement can carry several records for one drug — it may interact through more than one category.

Fexofenadine sits in 6 interaction categories. Open any one to see what the group means:

Cytochrome P450 3A4 (Cyp3A4) Substrates 121 ingredients

A drug-metabolism group: these medications are processed by the named liver enzyme (a cytochrome P450). Supplements that speed this enzyme up or slow it down can lower or raise the medication's levels in your body.

121 of the supplement ingredients on this page reach Fexofenadine through this category.

P-Glycoprotein Substrates 37 ingredients

A drug-transport group: these medications are moved in and out of cells by the P-glycoprotein pump. Supplements that affect the pump can change how much of the drug is absorbed or kept in the body.

37 of the supplement ingredients on this page reach Fexofenadine through this category.

Oral Drugs 17 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

17 of the supplement ingredients on this page reach Fexofenadine through this category.

Organic Anion-Transporting Polypeptide Substrates (Oatp) 17 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

17 of the supplement ingredients on this page reach Fexofenadine through this category.

Fexofenadine (Allegra) 9 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

9 of the supplement ingredients on this page reach Fexofenadine through this category.

Seizure Threshold Lowering Drugs 6 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

6 of the supplement ingredients on this page reach Fexofenadine through this category.

About Fexofenadine

Fexofenadine is an antihistamine used to relieve allergy symptoms like sneezing, itchy eyes, hives, and itchy rash.

Generic name: Fexofenadine  ·  Brand name: Allegra.

See the full Fexofenadine drug information
Check a real product

Take a Supplement Product? Check the Whole Bottle Against Fexofenadine

Most supplements are combination products — and the interaction may come from an ingredient you didn’t buy it for. Search any product below (or scan its label) and we’ll check every ingredient on it against Fexofenadine.

Search a supplement product

Type a product name, brand, or UPC — smart search across our full catalog.

Grounded search over our product catalog — every verdict comes from our interaction database, never AI guesswork. How we use AI

Or scan the bottle

Photograph any Supplement Facts panel — we read the ingredients and check each one against your medications. Free, in seconds.

Open the label scanner

Prefer typing? The interaction checker looks up products by name too.

Pharmacist Counseling Corner

Fexofenadine & Supplements: Common Questions

What supplements interact with Fexofenadine?
More than you might expect — 154 in total, though they are far from equal: 5 are rated major, 111 moderate, and 38 minor. The ranked list on this page puts the ones that genuinely matter first, and every entry opens a full report on that exact pair. The highest-ranked right now: Apple, Grapefruit, Sweet Orange.
Which Fexofenadine supplement interactions are the most serious?
Focus on the major group: Apple, Grapefruit, Sweet Orange, Activated Charcoal and St. John's Wort. A major rating means the combination can be clinically significant, not that harm is guaranteed — but it's exactly the kind of thing to run past your pharmacist before your next dose, not after. Jump to the ranked list.
Can I take vitamins or supplements while on Fexofenadine?
Usually yes — most people on Fexofenadine can take most supplements. The catch is the exceptions, and they aren't always the exotic ones (St. John's Wort trips up more prescriptions than almost anything sold next to it). Look up each ingredient you actually take in the list above, and treat "no known interaction" as a green-ish light, not a guarantee. Try the label scanner or the interaction checker.
Do brands like Allegra have the same supplement interactions as Fexofenadine?
Yes — Allegra all contain Fexofenadine, so everything on this page applies to them equally. Interactions belong to the active drug, never to the brand on the box; the same is true of generics.
Where do these interaction ratings come from?
Every rating comes from the Natural Medicines database — the same evidence-graded reference pharmacists and hospitals use — and each interaction carries three separate grades: severity (how bad it can be), likelihood (how well it's documented in studies and case reports), and an evidence level. Our pharmacists review the content; we never let an AI decide an interaction. See how to read the ratings and our editorial policy.
What about Fexofenadine and my other medications?
This page covers Fexofenadine against supplements and herbal ingredients. Checking Fexofenadine against your other prescription or OTC medications is a different tool — our drug interaction checker covers that side. Head to the drug–drug interaction checker, or read the full Fexofenadine drug information.

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

Where next

More Free Pharmacist Tools

Supplement interaction checker Check any supplement or product against your medications Supplement label scanner Photograph a Supplement Facts panel; we check every ingredient Browse medications A–Z Every drug we’ve checked against herbs & supplements Ingredient directory Every vitamin, herb & mineral we track, with interaction data Product directory Look up any bottle by name, brand, or barcode Ask a pharmacist Free, personal answer from our licensed team
Sourcing

Where This Data Comes From — and Why You Can Trust It

🧪 Licensed clinical database

Every interaction verdict on this page comes from Natural Medicines Pro (TRC Healthcare / Therapeutic Research) — the same evidence-graded reference used by pharmacists and hospitals. We license this data directly; we do not scrape it, and no AI invents an interaction.

🧑‍⚕️ Pharmacist review

This page is curated and coded by , Clinical Pharmacist, with additional analysis by the HelloPharmacist Pharmacist Team. Editorial commentary is ours; the licensed interaction records are shown as sourced.

🔄 Kept current

Our interaction database refreshes on a weekly cycle, and this page re-checks the live database every time it’s rebuilt — what you see reflects the database as of September 22, 2026.

🔍 Full transparency

How every dataset on this site is sourced, licensed, and updated is documented publicly: our data sources · editorial policy · how we use AI.

Educational information, not medical advice. An interaction being on file does not mean it will happen to you — and absence of one is not proof of safety. Never start or stop a medication or supplement without talking to your pharmacist or doctor.