Drug & supplement interaction

Theaflavin + Margetuximab-Cmkb

Margetuximab-Cmkb brand name: Margenza.

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 Theaflavin and Margetuximab-Cmkb 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

Theaflavin and Margetuximab-Cmkb

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 Margetuximab-Cmkb and Theaflavin 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.

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.

Theaflavin safety at a glance

Theaflavin overall Use caution Black tea is generally safe in normal amounts, but concentrated extracts are less studied.
Pregnancy Use caution Limit caffeine-containing tea and avoid high-dose extracts unless your doctor approves.
Breastfeeding Use caution Caffeine passes into breast milk, so limit intake and avoid concentrated extracts.

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

Still wondering about combining Margetuximab-Cmkb and Theaflavin? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
Keep it in perspective

Theaflavin Does Interact With Other Medications

Theaflavin has 130 moderate known drug interactions in our database — Margetuximab-Cmkb isn’t one of them. If you take anything else, check it against the full list below.

Moderate 130 No known interaction 2,700 (incl. Margetuximab-Cmkb)
Taking anything else?

Check Another of Your Medications Against Theaflavin

Covers the 2,830 medications we’ve checked against Theaflavin. Pick one to open its full report.

What to actually watch for

What Margetuximab-Cmkb’s Own FDA Label Lists

This is not an interaction — none of it involves Theaflavin. These are the most notable effects listed in the ADVERSE REACTIONS section of Margetuximab-Cmkb’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. 6 of them are worth acting on rather than waiting out — marked below.

  • Fainting Worth acting on
  • Kidney problems Worth acting on
  • Raised blood pressure Worth acting on
  • Shortness of breath Worth acting on
  • A low white blood cell count Worth acting on
  • A higher chance of infection Worth acting on
  • Migraine
  • A change in taste
  • Weight loss
  • Mouth irritation or sores

Showing the 10 most notable of 28 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 Margetuximab-Cmkb. Read the label on DailyMed › Theaflavin’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Theaflavin side to compare — that is a limit of the record, not a statement that Theaflavin has no side effects.

One more smart check

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

We hold 11 real supplement products containing Theaflavin, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Theaflavin. Even though Theaflavin itself has no known interaction with Margetuximab-Cmkb, 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 Theaflavin and Margetuximab-Cmkb 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 Theaflavin
Steady interest

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

29 days ago today
Medication Margetuximab-Cmkb
Steady interest

#1,807 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.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Theaflavin reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Theaflavin and Margetuximab-Cmkb 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 Theaflavin

What is Theaflavin?

  • Heart health and cholesterol support
  • Antioxidant support
  • Weight management
  • Blood sugar support
  • General wellness

Theaflavins are antioxidant compounds formed when tea leaves are oxidized to make black tea. Early research suggests they may help with cholesterol and provide antioxidant effects, but high-quality human evidence is limited and doses are not standardized. Drinking black tea is generally safe, but talk to your pharmacist or doctor before taking concentrated extracts.

Camellia sinensis · Theaceae · Leaves (fermented/oxidized, as in black tea) · Black tea, standardized black tea extract capsules, tablets, powders

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

Theaflavin: dosing

There is no established standard dose of theaflavin. Supplements vary widely in how much theaflavin they contain and how the black tea extract is standardized.If you choose to take a product, follow the directions on the label and do not exceed the recommended amount. Drinking black tea is a simpler, well-tolerated way to get theaflavins for most people.

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

Read the full Theaflavin monograph & all interactions
Medication

About Margetuximab-cmkb Injection

What Is Margetuximab-cmkb Injection Used For?

Brand name: Margenza

Margenza (margetuximab-cmkb) injection is used alongside chemotherapy to treat adults with metastatic HER2-positive breast cancer — cancer that has spread to other parts of the body and tests positive for the HER2 protein. It is specifically for people who have already received two or more anti-HER2 treatment regimens, with at least one used for metastatic disease.

This is a targeted therapy, not a stand-alone treatment. Margenza is always given together with chemotherapy, as directed by an oncologist.

See full Margetuximab-cmkb Injection drug information
Keep checking

Other Drugs & Theaflavin

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

0Major
130Moderate
0Minor
2,699No known interaction
130 Moderate 2,699 No interaction
Moderate

130 interactions

Showing 60 of 130 moderate interactions — see all 130 on the Theaflavin page.

No interaction 2,699 drugs checked — show the list

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

Showing the 60 most looked-up of 2,699 medications checked with no known interaction — see the full Theaflavin list.

See the full Theaflavin interactions page
See every supplement checked against Margetuximab-Cmkb, ranked by severity
Evidence & sources

Theaflavin References

The 4 references that drive our Theaflavin monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Maron DJ, Lu GP, Cai NS, et al. Cholesterol-lowering effect of a theaflavin-enriched green tea extract: a randomized controlled trial. Arch Intern Med 2003;163:1448-53.. PubMed
  2. Takemoto M, Takemoto H, Kouno H, Soeda T, Moriya T. A simple, enzymatic biotransformation method using fresh green tea leaves efficiently generates theaflavin-containing fermentation water that has potent physiological functions in mice and humans. Biol P PubMed
  3. Kondo A, Narumi K, Okuhara K, et al. Black tea extract and theaflavin derivatives affect the pharmacokinetics of rosuvastatin by modulating organic anion transporting polypeptide (OATP) 2B1 activity. Biopharm Drug Dispos. 2019;40(8):302-306. PubMed
  4. Gothandam K, Ganesan VS, Ayyasamy T, Ramalingam S. Antioxidant potential of theaflavin ameliorates the activities of key enzymes of glucose metabolism in high fat diet and streptozotocin - induced diabetic rats. Redox Rep. 2019;24(1):41-50. PubMed

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 Theaflavin and Margetuximab-Cmkb Together: Common Questions

Is it safe to take Theaflavin with Margetuximab-Cmkb?
We do not list a known interaction between Theaflavin and Margetuximab-Cmkb. 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 Theaflavin interact with any other medications?
Yes. Theaflavin has 130 documented drug interactions in our database — Margetuximab-Cmkb is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.

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

Where next

Keep Exploring

Theaflavin monograph Uses, safety profile, and every drug interaction in one place Margetuximab-cmkb Injection drug information The full plain-English guide to this medication Margetuximab-Cmkb supplement interactions Every supplement checked against Margetuximab-Cmkb, 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 4 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Margetuximab-Cmkb and Theaflavin?

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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.