Drug & supplement interaction

Black Rice + Phendimetrazine

Phendimetrazine brand names: Plegine, Metra, Weightrol.

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 Black Rice 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

Black Rice 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 Black Rice 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 Black Rice 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.

Black Rice safety at a glance

Black Rice overall Generally safe As a food, black rice is generally safe for most people when eaten in normal amounts.
Pregnancy Use caution Safe as a food, but concentrated supplements or extracts have not been well studied in pregnancy.
Breastfeeding Use caution Fine as a food, but the safety of concentrated extracts while breastfeeding is unknown.

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

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

What Phendimetrazine’s Own FDA Label Lists

This is not an interaction — none of it involves Black Rice. These are the most notable effects listed in the ADVERSE REACTIONS section of Phendimetrazine’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. 2 of them are worth acting on rather than waiting out — marked below.

  • Pain or burning when passing urine Worth acting on
  • Raised blood pressure Worth acting on
  • Tremor or shakiness
  • Flushing
  • Sweating
  • A fast or pounding heartbeat
  • Anxiety or restlessness
  • Trouble sleeping
  • Constipation
  • Stomach pain

Showing the 10 most notable of 14 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 Phendimetrazine. Read the label on DailyMed › Black Rice’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Black Rice side to compare — that is a limit of the record, not a statement that Black Rice has no side effects.

Overlapping uses

What Phendimetrazine Is Prescribed For, and What Black Rice 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. Black Rice 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.

Black Rice has been studied for:

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

    Black Rice for obesity

    It is unclear if oral black rice extract is beneficial for weight loss in postmenopausal adults.

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

We hold 26 real supplement products containing Black Rice, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Black Rice. Even though Black Rice 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 Black Rice 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 Black Rice
Steady interest

#774 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. Black Rice is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Black Rice reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Black Rice and Phendimetrazine 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 Black Rice

What is Black Rice?

Black Rice
  • Heart health support
  • Antioxidant intake
  • Digestive and gut health
  • Blood sugar and weight management
  • General nutrition

Black rice is a nutritious whole-grain food that is rich in fiber, plant protein, and antioxidant pigments called anthocyanins. Eaten as part of a balanced diet it is a healthy choice, but strong human evidence that black rice or its extracts treat or prevent specific diseases is still limited. Talk with your pharmacist or doctor before using concentrated black rice supplements.

Oryza sativa · Poaceae · Whole grain (bran and endosperm) · Whole grain, cooked rice, flour, rice bran, extracts, and supplement capsules

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

Black Rice: dosing

There is no established medicinal dose for black rice. As a food, a typical serving is a cooked portion similar to other rice, included as part of a balanced diet.For supplements or extracts, follow the directions on the product label, since amounts vary by product and have not been standardized.

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

Read the full Black Rice 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 & Black Rice

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

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

Black Rice References

The 2 sources that drive our Black Rice monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Black Rice is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. Arsenic in Rice and Rice Products — U.S. Food and Drug Administration (FDA) Source
  2. Dietary Fiber — MedlinePlus (NIH) Source

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 Black Rice and Phendimetrazine Together: Common Questions

Is it safe to take Black Rice with Phendimetrazine?
We do not list a known interaction between Black Rice 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 Black Rice 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 Black Rice 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 — Black Rice 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

Black Rice 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 2 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Phendimetrazine and Black Rice?

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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.