Drug & supplement interaction

N-methyltyramine + Fosinopril

Fosinopril brand name: Monopril.

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

N-methyltyramine has a minor interaction with Fosinopril. In animal research, N-methyltyramine increased blood pressure.

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

N-methyltyramine and Fosinopril

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

Minor

ANTIHYPERTENSIVE DRUGS

Why this applies to Fosinopril

Fosinopril falls under ANTIHYPERTENSIVE DRUGS — the group N-methyltyramine interacts with.

In animal research, N-methyltyramine increased blood pressure. This has not been shown in humans. Theoretically, concomitant use of N-methyltyramine and antihypertensive drugs might reduce the effects of antihypertensive drugs.
Some antihypertensive drugs include captopril (Capoten), enalapril (Vasotec), losartan (Cozaar), valsartan (Diovan), diltiazem (Cardizem), Amlodipine (Norvasc), hydrochlorothiazide (HydroDiuril), furosemide (Lasix), and many others.
Severity Minor 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: Fosinopril lowers your blood pressure by relaxing your blood vessels. N-methyltyramine, which often shows up in pre-workout and weight-loss products, may act as a mild stimulant that nudges your body to release adrenaline-like chemicals. That can gently raise blood pressure, which works against what fosinopril is trying to do. In theory, it could blunt how well your medicine controls your numbers.

I want to be honest about the evidence, though. This is based only on animal and lab studies, not people, so it's mostly theoretical and rated as minor. Still, if you have high blood pressure or heart concerns, I'd skip these stimulant supplements or run them by your pharmacist or doctor first. Keep an eye on your home readings if you do try one.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Stohs SJ, Hartman MJ. A review of the receptor binding and pharmacological effects of N-methyltyramine. Phytother Res. 2015;29(1):14-6.

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

N-methyltyramine Also Interacts With Other Medications

N-methyltyramine has 343 minor known drug interactions in our database — the Fosinopril one above is one of them. If you take anything else, check it against the full list below.

Minor 343 No known interaction 2,487 (incl. Fosinopril)
Taking anything else?

Check Another of Your Medications Against N-methyltyramine

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

From our Q&A

Questions About N-methyltyramine or Fosinopril

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers N-methyltyramine or Fosinopril, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Fosinopril

This page covers N-methyltyramine only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Fosinopril page lists 166 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), American Mistletoe (major), Asarabacca (major) and Siberian Cocklebur (major).

By severity: 6 major · 136 moderate · 24 minor.

From our pharmacist’s overview on the Fosinopril page

“I would read the supplement list for fosinopril (Monopril), a blood pressure medicine, with genuine care, because a handful of these combinations can do real harm. Most of what interacts touches blood pressure itself, either adding to fosinopril's lowering effect or working against it, tyramine being a well-documented example of the la…”

Reviewed by 2 · Jul 18, 2026

Open the Fosinopril interaction page

One more smart check

Taking N-methyltyramine as Part of a Dietary Supplement Product? Check It for Interactions

We hold 213 real supplement products containing N-methyltyramine, each one broken down to its full ingredient list — and combination products often carry several ingredients besides N-methyltyramine. Your product may carry other ingredients that interact with Fosinopril too, on top of N-methyltyramine — 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 N-methyltyramine and Fosinopril 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 N-methyltyramine
Top half

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

29 days ago today
Medication Fosinopril
Top 25%

#385 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 N-methyltyramine

What is N-methyltyramine?

  • Weight loss and fat burning
  • Energy and pre-workout supplements
  • Sports performance
  • Appetite control

N-methyltyramine is a natural compound related to tyramine that is found in bitter orange, barley, and other plants, and it is often added to weight-loss and pre-workout supplements. Solid human research on its safety and effectiveness is very limited, and because it may stimulate the body like other amines, people with heart problems or high blood pressure should be especially careful. Talk to a pharmacist or doctor before using any product that contains it.

Read the full N-methyltyramine monograph & all interactions
Medication

About Fosinopril

What Is Fosinopril Used For?

Brand name: Monopril

Fosinopril Sodium tablets are used to treat high blood pressure (hypertension). They can be used alone or combined with a water pill (diuretic) when blood pressure needs more control.

Fosinopril Sodium tablets are also used as part of a treatment plan for heart failure, added on top of other standard therapies such as diuretics, with or without digitalis.

See full Fosinopril drug information
Keep checking

Other Drugs & N-methyltyramine

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

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

343 interactions

Showing 60 of 343 minor interactions — see all 343 on the N-methyltyramine page.

No interaction 2,486 drugs checked — show the list

We also checked N-methyltyramine 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 N-methyltyramine list.

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

Can you take N-methyltyramine with Fosinopril?
There is only a minor interaction, which is usually not serious. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the N-methyltyramine and Fosinopril interaction?
We rate it Minor. This interaction is generally not clinically significant, but it remains worth noting and discussing with your pharmacist.

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

Still Have a Question About Fosinopril and N-methyltyramine?

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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.