Drug & supplement interaction

Rice Bran + Phendimetrazine

Phendimetrazine brand names: Plegine, Metra, Weightrol.

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

We found no known interaction between Rice Bran and Phendimetrazine 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

Rice Bran and Phendimetrazine

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 Phendimetrazine and Rice Bran 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 Rice Bran at all — not against Phendimetrazine, 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.

Rice Bran safety at a glance

Rice Bran overall Use caution Generally safe as food, but concentrated supplements have less safety data and may cause digestive effects.
Pregnancy Likely Safe When used orally in amounts commonly found in foods. There is insufficient reliable information available about the safety of rice bran when used for medicinal... Read the full pregnancy detail
Breastfeeding Likely Safe When used orally in amounts commonly found in foods. There is insufficient reliable information available about the safety of rice bran when used for medicinal... Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Phendimetrazine and Rice Bran? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Rice Bran Itself Has Been Linked To

This is not an interaction — nothing below involves Phendimetrazine. It is the side-effect record for Rice Bran on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Rice Bran, this list is the first place to look. 2 entries are worth acting on rather than waiting out — marked below.

  • Wheezing / An allergic reaction Worth acting on Additional detail

    “Orally and topically, rice bran can cause allergic reactions such as urticaria, angioedema, wheezing, itching, and cough. In a case report, a 5-year-old male presented with allergic eczema, urticaria, and cough due to rice bran ingestion. In another case report, a 14-year-old male developed food-dependent, exercise-induced anaphylaxis after consuming 150 grams of rice bran.”

    Rice Bran · Natural Medicines adverse-effect record, reported in cough.

    3 sources cited
    1. 100733. Togashi Y, Inomata N, Suzuki A, Hakuta A, Aihara M. Pediatric case with rice bran allergy induced by epicutaneous sensitization in a family rice shop. Allergol Int. 2019;68(1):117-118. PubMed
    2. 106589. Haneda Y, Kadowaki S, Furui M, Taketani T. A pediatric case of food-dependent exercise-induced anaphylaxis due to rice bran. Asia Pac Allergy 2021;11(1):e4. PubMed
    3. 100732. Satoh R, Tsuge I, Tokuda R, Teshima R. Analysis of the distribution of rice allergens in brown rice grains and of the allergenicity of products containing rice bran. Food Chem. 2019;276:761-767. PubMed
  • A severe allergic reaction / Hives Worth acting on Additional detail

    “Orally, rice bran is generally well tolerated. However, increasing the amount of bran in the diet can cause transient abdominal discomfort, flatulence, and erratic bowel habits.

    Most Common Adverse Effects:

    Orally: Abdominal discomfort, erratic bowel habits, flatulence.

    Topically: Erythema, itching.

    Serious Adverse Effects (Rare):

    All ROAs: Anaphylactic reactions, including urticaria and angioedema.”

    Rice Bran · Natural Medicines adverse-effect record, reported in erythema.

  • Bloating or gas / Stomach upset Additional detail

    “Orally, increasing the amount of bran in the diet can cause erratic bowel habits, flatulence, and abdominal discomfort during the first few weeks.”

    Rice Bran · Natural Medicines adverse-effect record, reported in flatulence.

    2 sources cited
    1. 272. Covington TR, et al. Handbook of Nonprescription Drugs. 11th ed. Washington, DC: American Pharmaceutical Association, 1996.
    2. 106588. So WKW, Chan JYW, Law BMH, et al. Effects of a Rice Bran Dietary Intervention on the Composition of the Intestinal Microbiota of Adults with a High Risk of Colorectal Cancer: A Pilot Randomised-Controlled Trial. Nutrients 2021;13(2):526. PubMed
  • Cough Additional detail

    Recorded for Rice Bran in the same Natural Medicines adverse-effect record shown under Wheezing / An allergic reaction above.

  • Itching Additional detail

    Recorded for Rice Bran in the same Natural Medicines adverse-effect record shown under A severe allergic reaction / Hives above.

  • A skin rash Additional detail

    “Topically, rice bran broth baths can cause itching and skin redness. In rare cases, rash and itching from rice bran has been associated with contact infestation with Pyemotes tritici, an arthropod commonly called straw itch mite.”

    Rice Bran · Natural Medicines adverse-effect record, reported in pruritus.

    2 sources cited
    1. 872. Fujiwaki T, Furusho K. The effects of rice bran broth bathing in patients with atopic dermatitis. Acta Paediatr Jpn 1992;34:505-10.
    2. 2284. Uenotsuchi T, Satoh E, Kiryu H, Yano Y. Pyemotes dermatitis caused by indirect contact with husk rice. Br J Dermatol 2000;143:680-2. DOI

Everything above comes from the Natural Medicines adverse-effect record for Rice Bran — expand a row for the licensed statement it rests on. We read the ADVERSE REACTIONS section of Phendimetrazine’s FDA label too, and the two lists don’t meaningfully overlap — which is why no Phendimetrazine column appears here.

Special populations

Rice Bran in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Safe

When used orally in amounts commonly found in foods. There is insufficient reliable information available about the safety of rice bran when used for medicinal purposes during pregnancy and lactation; avoid using.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

Overlapping uses

What Phendimetrazine Is Prescribed For, and What Rice Bran Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Phendimetrazine is a prescription medicine with approved uses on its FDA label. Rice Bran is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Phendimetrazine is prescribed for: Phendimetrazine tartrate is used to help manage exogenous obesity (excess body weight from outside causes like diet and lifestyle) as a short-term addition to a calorie-restricted diet. It is intended for adults with a BMI of 30 or higher, or a BMI of 27 or higher when other risk factors — such as high blood pressure, diabetes, or high cholesterol — are also present. It is approved for use as monotherapy only, meaning it must not be combined with other weight-loss drugs or stimulants. Both the tablet form and the extended-release capsule form are approved for this purpose.

Read the rest of what Phendimetrazine is prescribed for

This medication is meant to be used for only a few weeks as part of a broader weight-management plan.

Rice Bran has been studied for:

  • Obesity studied, not established Rice Bran has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Rice Bran for obesity

    Although there has been interest in using oral rice bran for obesity, there is insufficient reliable information about the clinical effects of rice bran for this purpose.

  • Diabetes studied, not established Rice Bran has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Rice Bran for diabetes

    It is unclear if oral rice bran is beneficial in patients with type 2 diabetes.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Phendimetrazine on your own; if you are taking Rice Bran for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Phendimetrazine

This page covers Rice Bran only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Phendimetrazine page lists 17 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Guar Gum (moderate).

By severity: 1 major · 7 moderate · 9 minor.

From our pharmacist’s overview on the Phendimetrazine page

“Of the 17 supplements on file for phendimetrazine, an appetite-suppressant stimulant prescribed short term for weight loss, activated charcoal is the one that demands real caution. Charcoal binds medications in the gut and can sharply cut how much of a drug your body absorbs, leaving you with less appetite control than your prescriptio…”

Reviewed by 2 · Jul 18, 2026

Open the Phendimetrazine interaction page

One more smart check

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

We hold 708 real supplement products containing Rice Bran, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Rice Bran. Even though Rice Bran itself has no known interaction with Phendimetrazine, 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 Rice Bran and Phendimetrazine 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 Rice Bran
Top 25%

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

29 days ago today
Medication Phendimetrazine
Top 25%

#334 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 Rice Bran reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Rice Bran and Phendimetrazine records this page draws on were last updated July 10, 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 Rice Bran

What is Rice Bran?

  • High cholesterol
  • Digestive health and fiber
  • Heart health support
  • Blood sugar support
  • Skin care (topical oil)

Rice bran is the nutrient-rich outer layer of the rice grain and is a good source of fiber, healthy fats, and plant compounds. It is most studied for helping lower cholesterol, but for most other uses the evidence is limited. It is generally considered safe as a food, but talk with your pharmacist or doctor before using concentrated supplements.

Oryza sativa · Poaceae · Bran (the outer layer of the rice grain) and rice bran oil · Powder, capsules, tablets, rice bran oil, and as a fiber food additive

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

Rice Bran: dosing

There is no single official or standardized dose for rice bran supplements. The right amount depends on the product, the form (powder, capsule, or oil), and your reason for using it.The best approach is to follow the directions on the product label and not exceed the recommended amount. If you are adding rice bran for fiber, start with a small amount and increase slowly while drinking plenty of water.

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

Read the full Rice Bran monograph & all interactions
Medication

About Phendimetrazine

What Is Phendimetrazine Used For?

Brand names: Plegine, Metra, Weightrol

Phendimetrazine tartrate is used to help manage exogenous obesity (excess body weight from outside causes like diet and lifestyle) as a short-term addition to a calorie-restricted diet. It is intended for adults with a BMI of 30 or higher, or a BMI of 27 or higher when other risk factors — such as high blood pressure, diabetes, or high cholesterol — are also present.

It is approved for use as monotherapy only, meaning it must not be combined with other weight-loss drugs or stimulants. Both the tablet form and the extended-release capsule form are approved for this purpose. This medication is meant to be used for only a few weeks as part of a broader weight-management plan.

See full Phendimetrazine drug information
Keep checking

Other Drugs & Rice Bran

Browse every other medication we’ve checked against Rice Bran — 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 Rice Bran 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 Rice Bran list.

See the full Rice Bran interactions page
See every supplement checked against Phendimetrazine, ranked by severity
Evidence & sources

Rice Bran References

The 7 references that drive our Rice Bran 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. Covington TR, et al. Handbook of Nonprescription Drugs. 11th ed. Washington, DC: American Pharmaceutical Association, 1996.
  2. Fujiwaki T, Furusho K. The effects of rice bran broth bathing in patients with atopic dermatitis. Acta Paediatr Jpn 1992;34:505-10.
  3. Uenotsuchi T, Satoh E, Kiryu H, Yano Y. Pyemotes dermatitis caused by indirect contact with husk rice. Br J Dermatol 2000;143:680-2. DOI
  4. Satoh R, Tsuge I, Tokuda R, Teshima R. Analysis of the distribution of rice allergens in brown rice grains and of the allergenicity of products containing rice bran. Food Chem. 2019;276:761-767. PubMed
  5. Togashi Y, Inomata N, Suzuki A, Hakuta A, Aihara M. Pediatric case with rice bran allergy induced by epicutaneous sensitization in a family rice shop. Allergol Int. 2019;68(1):117-118. PubMed
  6. So WKW, Chan JYW, Law BMH, et al. Effects of a Rice Bran Dietary Intervention on the Composition of the Intestinal Microbiota of Adults with a High Risk of Colorectal Cancer: A Pilot Randomised-Controlled Trial. Nutrients 2021;13(2):526. PubMed
  7. Haneda Y, Kadowaki S, Furui M, Taketani T. A pediatric case of food-dependent exercise-induced anaphylaxis due to rice bran. Asia Pac Allergy 2021;11(1):e4. 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 Rice Bran and Phendimetrazine Together: Common Questions

Is it safe to take Rice Bran with Phendimetrazine?
We do not list a known interaction between Rice Bran and Phendimetrazine. 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.
Are Rice Bran and Phendimetrazine used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Rice Bran in each. That is a conversation for your prescriber, especially if Phendimetrazine is being adjusted to a target.
Does Phendimetrazine interact with any supplements?
Yes. Phendimetrazine has documented interactions with 17 supplements in our database — Rice Bran is not one of them. The Phendimetrazine 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

Rice Bran monograph Uses, safety profile, and every drug interaction in one place Phendimetrazine drug information The full plain-English guide to this medication Phendimetrazine supplement interactions Every supplement checked against Phendimetrazine, 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 7 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Phendimetrazine and Rice Bran?

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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.