Medication interaction hub

What Supplements Interact with Grepafloxacin?

Grepafloxacin brand name: Raxar. Every interaction below applies to the brands too.

164 Interactions 9 Major 113 Moderate 42 Minor
Curated & coded by · Clinical Pharmacist · Updated September 23, 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 Grepafloxacin? 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 Grepafloxacin 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.

A week on grepafloxacin (Raxar), a quinolone antibiotic, often comes with juice at breakfast, coffee through the day, maybe a probiotic for the stomach, and each of those shows up on this list. The nine major entries among these 164 deserve your attention first: grapefruit and other fruit juices can block the transporter that carries the pill into your bloodstream, leaving less antibiotic to fight the infection, while a few herbs, ephedra among them, can add dangerous strain to the heart's rhythm.

Of the rest, 113 rate moderate and 42 minor. The largest moderate cluster comes from grepafloxacin slowing the body's clearance of caffeine, so caffeinated drinks hit harder and linger during treatment. Mineral supplements can bind the pill in the gut, and the antibiotic kills live probiotic organisms swallowed alongside it, so space those doses well apart and go easy on caffeine until the course ends.

— , Clinical Pharmacist · July 18, 2026

Major 9 Moderate 113 Minor 42 No known interaction 1,288

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 ↓

Top Ingredient Interactions

Grepafloxacin: Top Interactions at a Glance

The most significant Grepafloxacin supplement & herbal interactions, colored by severity. Tap any ingredient to open the full report for that pair.

Showing the 12 highest-ranked of 164 interacting ingredients — plus 1,288 more checked with no known interaction. See the complete ranked list.

Start here

The Major Interactions to Know About

The most clinically significant Grepafloxacin + supplement combinations in our database, best-documented first. Open any card for the full report.

Major Likelihood Likely Apple + Grepafloxacini

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

Read the full interaction Major Likelihood Likely Grapefruit + Grepafloxacini

Grapefruit juice can decrease levels of drugs that are substrates of OATP.

Read the full interaction Major Likelihood Likely Sweet Orange + Grepafloxacini

Consuming sweet orange juice can decrease oral absorption of OATP substrates.

Read the full interaction Major Likelihood Probable Activated Charcoal + Grepafloxacini

Activated charcoal reduces systemic exposure to many drugs, including those that undergo enterohepatic recirculation, regardless of the route of administration.

Read the full interaction Major Likelihood Probable Arsenic + Grepafloxacini

Arsenic trioxide can prolong the QT interval.

Read the full interaction Major Likelihood Probable Cesium + Grepafloxacini

Theoretically, taking cesium concomitantly with other drugs that prolong the QT interval may increase the risk of ventricular arrhythmias and death.

Read the full interaction
The complete list

Every Supplement Checked Against Grepafloxacin

All 1,452 ingredients in our database, ranked by severity — 164 with a Grepafloxacin interaction on file and 1,288 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 Grepafloxacin?

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 Strontium with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, strontium might decrease the absorption of quinolone antibiotics.

Full Strontium + Grepafloxacin answer

Can you take Whey Protein with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, whey protein might decrease quinolone absorption.

Full Whey Protein + Grepafloxacin answer

Can you take Yerba Mate with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, quinolone antibiotics might increase the levels and adverse effects of the caffeine in yerba mate.

Full Yerba Mate + Grepafloxacin answer

Can you take Zinc with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Zinc can decrease the levels and clinical effects of quinolones antibiotics.

Full Zinc + Grepafloxacin answer

Can you take Adrafinil with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, adrafinil might reduce the levels and clinical effects of CYP1A2 substrates.

Full Adrafinil + Grepafloxacin answer

Can you take African Wild Potato with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. In vitro research shows that African wild potato extract inhibits cytochrome P450 1A2 (CYP1A2).

Full African Wild Potato + Grepafloxacin answer

Can you take Ashitaba with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. In vitro research shows that ashitaba extract inhibits cytochrome P450 (CYP) 1A2.

Full Ashitaba + Grepafloxacin answer

Can you take Bacopa with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, bacopa might increase the levels and adverse effects of CYP1A2 substrates.

Full Bacopa + Grepafloxacin answer

Can you take Baikal Skullcap with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, Baikal skullcap may increase levels of drugs metabolized by CYP1A2 enzymes.

Full Baikal Skullcap + Grepafloxacin answer

Can you take Banaba with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, concomitant use of banaba with substrates of OATP might reduce the bioavailability of the OATP substrate.

Full Banaba + Grepafloxacin answer

Can you take Bitter Orange with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, bitter orange might have an additive effect when combined with drugs that prolong the QT interval, potentially increasing the...

Full Bitter Orange + Grepafloxacin answer

Can you take Black Hoof Mushroom with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, black hoof mushroom might increase the levels and clinical effects of CYP1A2 substrates.

Full Black Hoof Mushroom + Grepafloxacin answer

Can you take Boswellia Serrata with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, Boswellia serrata might increase the levels of CYP1A2 substrates.

Full Boswellia Serrata + Grepafloxacin answer

Can you take Broccoli with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, broccoli might reduce the levels and effects of drugs metabolized by CYP1A2.

Full Broccoli + Grepafloxacin answer

Can you take Brussels Sprout with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Animal research suggests that Brussels sprout can induce cytochrome P450 1A2 (CYP1A2) activity.

Full Brussels Sprout + Grepafloxacin answer

Can you take Bulbine Natalensis with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, Bulbine natalensis stem might reduce the levels and clinical effects of CYP1A2 substrates.

Full Bulbine Natalensis + Grepafloxacin answer

Can you take Cabbage with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, cabbage might decrease levels of drugs metabolized by CYP1A2.

Full Cabbage + Grepafloxacin answer

Can you take Catechu with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, black catechu may increase the levels and clinical effects of CYP1A2 substrates.

Full Catechu + Grepafloxacin answer

Can you take Cauliflower with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Preliminary clinical evidence suggests that eating cruciferous vegetables, including broccoli, cauliflower, daikon radish sprouts, and cabba...

Full Cauliflower + Grepafloxacin answer

Can you take Celery with Grepafloxacin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, celery might increase levels of drugs metabolized by CYP1A2.

Full Celery + Grepafloxacin 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) Grepafloxacin is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Grepafloxacin, 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.

Grepafloxacin sits in 7 interaction categories. Open any one to see what the group means:

Cytochrome P450 1A2 (Cyp1A2) Substrates 79 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.

79 of the supplement ingredients on this page reach Grepafloxacin through this category.

Antibiotic Drugs 27 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.

27 of the supplement ingredients on this page reach Grepafloxacin through this category.

Quinolone Antibiotics 24 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.

24 of the supplement ingredients on this page reach Grepafloxacin 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 Grepafloxacin 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 Grepafloxacin through this category.

Qt Interval-Prolonging Drugs 13 ingredients

Medications that can affect the heart's electrical rhythm (the QT interval). Supplements with similar effects can add to that risk.

13 of the supplement ingredients on this page reach Grepafloxacin through this category.

Cytochrome P450 1A2 (Cyp1A2) Substrates 1 ingredient

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.

1 of the supplement ingredient on this page reaches Grepafloxacin through this category.

Related: does Grepafloxacin deplete any nutrients?

Grepafloxacin has 7 reported nutrient associations in the research literature — see the Grepafloxacin nutrient depletion report.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Grepafloxacin

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 Grepafloxacin.

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

Grepafloxacin & Supplements: Common Questions

What supplements interact with Grepafloxacin?
Our database currently documents 164 ingredients with a known Grepafloxacin interaction (9 major, 113 moderate, 42 minor). The practical move: scan the major group first, then look up the exact supplements you take rather than reading all 164. The highest-ranked right now: Apple, Grapefruit, Sweet Orange.
Which Grepafloxacin supplement interactions are the most serious?
The 9 major-rated combinations — led by Apple, Grapefruit, Sweet Orange, Activated Charcoal and Arsenic — deserve real caution: these are the ones generally best avoided, or used only with your prescriber watching. If you take any of them today, don't panic and don't stop anything abruptly — call your pharmacist first. Jump to the ranked list.
Can I take vitamins or supplements while on Grepafloxacin?
Plenty of supplements coexist fine with Grepafloxacin; a shorter list does not. Rather than memorizing it, check the specific ingredients on your labels — the ranked list above covers every one we've checked, and multi-ingredient products can be checked label-by-label with our scanner. Try the label scanner or the interaction checker.
Do brands like Raxar have the same supplement interactions as Grepafloxacin?
Yes — Raxar all contain Grepafloxacin, 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.
Does Grepafloxacin deplete any vitamins or nutrients?
It might — Grepafloxacin has 7 reported nutrient-depletion associations in the research literature, which is a different question from interactions: instead of a supplement changing the drug, the drug may lower a nutrient over time. See the Grepafloxacin nutrient depletion report for the specifics and what to discuss with your pharmacist.
What about Grepafloxacin and my other medications?
This page covers Grepafloxacin against supplements and herbal ingredients. Checking Grepafloxacin 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.

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 23, 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.