Drug & supplement interaction

White Pepper + Omacetaxine Mepesuccinate

Omacetaxine Mepesuccinate brand name: Synribo.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

White Pepper has a moderate interaction with Omacetaxine Mepesuccinate. Theoretically, white pepper might increase levels of p-glycoprotein substrates.

Read the full interaction report
SeverityModerate
LikelihoodPossible
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

White Pepper and Omacetaxine Mepesuccinate

Here is the interaction we found between these two, with the evidence behind it.

Moderate

P-GLYCOPROTEIN SUBSTRATES

Why this applies to Omacetaxine Mepesuccinate

Omacetaxine Mepesuccinate falls under P-GLYCOPROTEIN SUBSTRATES — the group White Pepper interacts with.

Theoretically, white pepper might increase levels of p-glycoprotein substrates. The piperine constituent of white pepper seems to inhibit p-glycoprotein in vitro.
Some drugs metabolized by p-glycoprotein include some chemotherapeutic agents (etoposide, paclitaxel, vinblastine, vincristine, vindesine), antifungals (ketoconazole, itraconazole), protease inhibitors (amprenavir, indinavir, nelfinavir, saquinavir), H2 antagonists (cimetidine, ranitidine), some calcium channel blockers (diltiazem, verapamil), digoxin, corticosteroids, erythromycin, cisapride (Propulsid), fexofenadine (Allegra), cyclosporine, loperamide (Imodium), quinidine, and others.
Severity Moderate Likelihood Possible Evidence D

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.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the gist for Synribo (omacetaxine). White pepper contains a compound called piperine, and in lab studies piperine seems to block a cellular pump called P-glycoprotein. That pump helps move certain drugs out of your cells. Omacetaxine is handled in part by this same pump, so in theory, blocking it could let a little more of the drug stick around in your body. That could mean a slightly stronger effect and a bit more risk of its usual side effects, like low blood counts, fatigue, nausea, or infections.

The honest truth is this concern is theoretical, based only on test-tube research, not real patients. Everyday seasoning amounts on your food are very unlikely to matter. If you're thinking about concentrated pepper or piperine supplements, please run it by your oncology team or pharmacist first.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Bhardwaj RK, Glaeser H, Becquemont L, et al. Piperine, a major constituent of black pepper, inhibits human P-glycoprotein and CYP3A4. J Pharmacol Exp Ther 2002;302:645-50. PubMed
  2. Han, Y., Chin Tan, T. M., and Lim, L. Y. In vitro and in vivo evaluation of the effects of piperine on P-gp function and expression. Toxicol.Appl.Pharmacol. 8-1-2008;230(3):283-289. PubMed
  3. Aher, S., Biradar, S., Gopu, C. L., and Paradkar, A. Novel pepper extract for enhanced P-glycoprotein inhibition. J Pharm.Pharmacol. 2009;61(9):1179-1186. PubMed

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction 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.
  • PossibleInteraction 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.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

White Pepper Also Interacts With Other Medications

White Pepper has 975 moderate, 3 minor known drug interactions in our database — the Omacetaxine Mepesuccinate one above is one of them. If you take anything else, check it against the full list below.

Moderate 975 Minor 3 No known interaction 1,852 (incl. Omacetaxine Mepesuccinate)
Taking anything else?

Check Another of Your Medications Against White Pepper

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

Everything else you take

See Every Supplement That Interacts With Omacetaxine Mepesuccinate

This page covers White Pepper only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Omacetaxine Mepesuccinate page lists 87 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: St. John's Wort (major), Active Hexose Correlated Compound (ahcc) (moderate), Alfalfa (moderate), American Ginseng (moderate) and Andrographis (moderate).

By severity: 1 major · 77 moderate · 9 minor.

Open the Omacetaxine Mepesuccinate interaction page

One more smart check

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

We hold 2 real supplement products containing White Pepper, each one broken down to its full ingredient list — and combination products often carry several ingredients besides White Pepper. Your product may carry other ingredients that interact with Omacetaxine Mepesuccinate too, on top of White Pepper — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where White Pepper and Omacetaxine Mepesuccinate 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 White Pepper
Steady interest

#1,206 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Omacetaxine Mepesuccinate
Top 25%

#389 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.

Supplement

About White Pepper

What is White Pepper?

  • Digestive upset
  • Seasoning and appetite support
  • Cough and cold remedies (traditional)
  • Minor aches and pains (traditional)
  • Antimicrobial (traditional)

White pepper comes from the same plant as black pepper and is mostly used as a kitchen spice. In normal food amounts it is generally safe for most people, but there is little solid human research supporting its use as a medicine. Talk with your pharmacist or doctor before using concentrated supplements, especially if you are pregnant, breastfeeding, or have a health condition.

Read the full White Pepper monograph & all interactions
Medication

About Omacetaxine Injection

What Is Omacetaxine Injection Used For?

Brand name: Synribo

  • Omacetaxine injection is used to treat adults with chronic myelogenous leukemia (CML; a type of cancer of the white blood cells) who have already been treated with at least two other medications for CML and can no longer benefit from these medications or cannot take these medications due to side effects. Omacetaxine injection is in a class of medications called protein synthesis inhibitors. It works by slowing the growth of cancer cells.

See full Omacetaxine Injection drug information
Keep checking

Other Drugs & White Pepper

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

0Major
975Moderate
3Minor
1,851No known interaction
975 Moderate 3 Minor 1,851 No interaction
Moderate

975 interactions

Showing 60 of 975 moderate interactions — see all 975 on the White Pepper page.

Minor

3 interactions

No interaction 1,851 drugs checked — show the list

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

Showing the 60 most looked-up of 1,851 medications checked with no known interaction — see the full White Pepper list.

See the full White Pepper interactions page
See every supplement checked against Omacetaxine Mepesuccinate, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
White Pepper monograph › Uses, safety, and every drug interaction in one place Omacetaxine Mepesuccinate supplement interactions › Every supplement checked against Omacetaxine Mepesuccinate, ranked by severity Omacetaxine Injection drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking White Pepper and Omacetaxine Mepesuccinate Together: Common Questions

Can you take White Pepper with Omacetaxine Mepesuccinate?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the White Pepper and Omacetaxine Mepesuccinate interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Omacetaxine Mepesuccinate and White Pepper?

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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.