Drug & supplement interaction

Isopropylnorsynephrine + Diethylpropion

Diethylpropion brand names: Radtue, Tenuate, Durad, Tenuate Dosepan.

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

Isopropylnorsynephrine has a moderate interaction with Diethylpropion. Theoretically, taking isopropylnorsynephrine with stimulant drugs might have additive effects and increase the risk of adverse cardiovascular effects.

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

Isopropylnorsynephrine and Diethylpropion

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

Moderate

STIMULANT DRUGS

Why this applies to Diethylpropion

Diethylpropion falls under STIMULANT DRUGS — the group Isopropylnorsynephrine interacts with.

Theoretically, taking isopropylnorsynephrine with stimulant drugs might have additive effects and increase the risk of adverse cardiovascular effects.
Isopropylnorsynephrine is an investigational beta-agonist and a derivative of synephrine and octopamine, which are stimulant constituents of bitter orange. In vitro research shows that isopropylnorsynephrine is a highly selective, direct-acting beta-adrenergic receptor agonist with positive chronotropic effects. Theoretically, isopropylnorsynephrine may also have stimulant effects.
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 thing to keep in mind: diethylpropion is itself a stimulant that revs up your system, much like an amphetamine. It already nudges up your heart rate and blood pressure as part of how it curbs appetite. Isopropylnorsynephrine is also a stimulant, acting on the same kind of adrenergic receptors. So when you stack the two, the worry is additive stimulation, meaning a bigger combined push than either one alone.

In real terms, that could show up as a racing or pounding heartbeat, higher blood pressure, jitteriness, anxiety, or trouble sleeping. To be fair, this caution is theoretical and based on how these compounds behave, not on solid human studies. Still, doubling up on stimulants isn't worth the gamble. Please check with your pharmacist or doctor before combining them.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Cohen PA, Travis JC, Vanhee C, Ohana D, Venhuis BJ. Nine prohibited stimulants found in sports and weight loss supplements: deterenol, phenpromethamine (Vonedrine), oxilofrine, octodrine, beta-methylphenylethylamine (BMPEA), 1,3-dimethylamylamine (1,3-DMA
  2. Anderson WG. The sympathomimetic activity of N-isopropyloctopamine in vitro. J Pharmacol Exp Ther 1983;225(3):553-8. DOI

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

Isopropylnorsynephrine Also Interacts With Other Medications

Isopropylnorsynephrine has 343 moderate known drug interactions in our database — the Diethylpropion one above is one of them. If you take anything else, check it against the full list below.

Moderate 343 No known interaction 2,487 (incl. Diethylpropion)
Taking anything else?

Check Another of Your Medications Against Isopropylnorsynephrine

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

Everything else you take

See Every Supplement That Interacts With Diethylpropion

This page covers Isopropylnorsynephrine only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Diethylpropion page lists 61 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Ephedra (major), Peyote (major), Rauvolfia Vomitoria (major) and Sida Cordifolia (major).

By severity: 5 major · 43 moderate · 13 minor.

From our pharmacist’s overview on the Diethylpropion page

“Diethylpropion (Tenuate) is an appetite suppressant that works by revving up the nervous system, and that mechanism is why its interaction list calls for real vigilance. Of the 61 supplements and herbs on file, 44 add their own stimulant push, raising the risk of high blood pressure, a pounding heart, and sleeplessness.”

Reviewed by 2 · Jul 18, 2026

Open the Diethylpropion interaction page

One more smart check

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

We hold 48 real supplement products containing Isopropylnorsynephrine, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Isopropylnorsynephrine. Your product may carry other ingredients that interact with Diethylpropion too, on top of Isopropylnorsynephrine — 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 Isopropylnorsynephrine and Diethylpropion 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 Isopropylnorsynephrine
Steady interest

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

29 days ago today
Medication Diethylpropion
Steady interest

#2,295 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 Isopropylnorsynephrine

What is Isopropylnorsynephrine?

  • Weight loss and fat burning
  • Pre-workout energy and stimulation
  • Topical fat reduction (creams and gels)
  • Appetite suppression
  • Athletic performance

Isopropylnorsynephrine is a synthetic stimulant chemically related to synephrine, marketed mainly in weight-loss and pre-workout supplements. It has very little human safety or effectiveness research, and as a stimulant it may raise heart rate and blood pressure, so caution is strongly advised. Talk with a pharmacist or doctor before using any product that contains it.

Read the full Isopropylnorsynephrine monograph & all interactions
Medication

About Diethylpropion

What Is Diethylpropion Used For?

Brand names: Radtue, Tenuate, Durad, Tenuate Dosepan

Diethylpropion is used to help manage exogenous obesity (excess body weight from outside factors like diet) in adults with a body mass index (BMI) of 30 or higher who haven't lost enough weight through diet and exercise alone. It is meant to be used for only a few weeks as part of a calorie-restricted diet plan.

All available tablet products — both the immediate-release tablets and the extended-release tablets — are approved for this purpose. Each is approved for use as a single medication only; combining diethylpropion with any other weight-loss drug is not allowed.

See full Diethylpropion drug information
Keep checking

Other Drugs & Isopropylnorsynephrine

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

0Major
343Moderate
0Minor
2,486No known interaction
343 Moderate 2,486 No interaction
Moderate

343 interactions

Showing 60 of 343 moderate interactions — see all 343 on the Isopropylnorsynephrine page.

No interaction 2,486 drugs checked — show the list

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

Showing the 60 most looked-up of 2,486 medications checked with no known interaction — see the full Isopropylnorsynephrine list.

See the full Isopropylnorsynephrine interactions page
See every supplement checked against Diethylpropion, 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
Isopropylnorsynephrine monograph › Uses, safety, and every drug interaction in one place Diethylpropion supplement interactions › Every supplement checked against Diethylpropion, ranked by severity Diethylpropion 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 Isopropylnorsynephrine and Diethylpropion Together: Common Questions

Can you take Isopropylnorsynephrine with Diethylpropion?
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 Isopropylnorsynephrine and Diethylpropion 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 Diethylpropion and Isopropylnorsynephrine?

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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.