Drug & supplement interaction

Tyramine + Methyclothiazide

Methyclothiazide brand names: Enduron, Aquatensen.

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

Tyramine has a major interaction with Methyclothiazide. Tyramine may increase the risk of hypertension and reduce the effects of antihypertensive drugs.

Read the full interaction report
SeverityMajor
LikelihoodLikely
EvidenceB
What do Severity, Likelihood & Evidence mean?
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Interaction report

Tyramine and Methyclothiazide

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

Major

ANTIHYPERTENSIVE DRUGS

Why this applies to Methyclothiazide

Methyclothiazide falls under ANTIHYPERTENSIVE DRUGS — the group Tyramine interacts with.

Tyramine may increase the risk of hypertension and reduce the effects of antihypertensive drugs.
In humans, oral and intravenous tyramine increases systolic blood pressure.
Severity Major Likelihood Likely Evidence B

Well-controlled human studies have demonstrated the likely existence of this interaction.

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

Here's the thing to know if you take methyclothiazide for blood pressure: tyramine pushes your body to release norepinephrine, a chemical that tightens blood vessels and bumps your blood pressure and heart rate up. That works directly against what your water pill is trying to do, so a big load of tyramine could blunt your blood pressure control or cause a sudden spike.

Methyclothiazide isn't a prodrug, so this isn't about how it's broken down. It's simply two forces pulling in opposite directions. Normal food amounts of aged cheese or cured meat usually aren't a problem here. The real concern is concentrated tyramine, especially if you also take an MAO inhibitor. If your readings swing or you feel a pounding headache, check in with your pharmacist or doctor.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Gilliam LK, Palmer JP, Taborsky GJ Jr. Tyramine-mediated activation of sympathetic nerves inhibits insulin secretion in humans. J Clin Endocrinol Metab. 2007;92(10):4035-8. PubMed
  2. VanDenBerg CM, Blob LF, Kemper EM, Azzaro AJ. Tyramine pharmacokinetics and reduced bioavailability with food. J Clin Pharmacol. 2003;43(6):604-9. DOI
  3. Meck JV, Martin DS, D'Aunno DS, Waters WW. Pressor response to intravenous tyramine is a marker of cardiac, but not vascular, adrenergic function. J Cardiovasc Pharmacol. 2003;41(1):126-31. PubMed
  4. Colombo F, Porro T, del Rosso G, Bertalero P, Orlandi L, Libretti A. Cardiovascular responses to physical exercise and tyramine infusion in hypertensive and normotensive subjects. J Hum Hypertens. 1989;3(4):245-9.
  5. Pace DG, Reele SB, Rozik LM, Rogers-Phillips CA, Dabice JA, Givens SV. Evaluation of methods of administering tyramine to raise systolic blood pressure. Clin Pharmacol Ther. 1988;44(2):137-44. 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

Tyramine Also Interacts With Other Medications

Tyramine has 180 major, 1 moderate, 171 minor known drug interactions in our database — the Methyclothiazide one above is one of them. If you take anything else, check it against the full list below.

Major 180 Moderate 1 Minor 171 No known interaction 2,478 (incl. Methyclothiazide)
Taking anything else?

Check Another of Your Medications Against Tyramine

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

From our Q&A

Questions About Tyramine or Methyclothiazide

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Tyramine or Methyclothiazide, 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 Methyclothiazide

This page covers Tyramine only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Methyclothiazide page lists 227 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 Dolomite (major).

By severity: 10 major · 192 moderate · 25 minor.

Open the Methyclothiazide interaction page

One more smart check

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

We hold 20 real supplement products containing Tyramine, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Tyramine. Your product may carry other ingredients that interact with Methyclothiazide too, on top of Tyramine — 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 Tyramine and Methyclothiazide 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 Tyramine
Steady interest

#1,172 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Methyclothiazide
Top half

#1,285 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 Tyramine

What is Tyramine?

  • Studied for effects on blood pressure
  • Discussed in relation to migraine and headache triggers
  • Of interest in food and diet science
  • Subject of research on the nervous system

Tyramine is a natural compound formed when certain proteins break down, and it is found in aged cheeses, cured meats, fermented foods, and some other items. It is not a typical health supplement and is best known for the problems it can cause—such as dangerous spikes in blood pressure—in people taking certain medications or in those who are sensitive to it. If you have been told to follow a low-tyramine diet, talk with your pharmacist or doctor before making changes.

Read the full Tyramine monograph & all interactions
Medication

About Methyclothiazide

What Is Methyclothiazide Used For?

Brand names: Enduron, Aquatensen

  • Methyclothiazide is used to treat high blood pressure. Methyclothiazide is also used to treat edema (fluid retention; excess fluid held in body tissues) caused by various medical problems, including heart, kidney, and liver disease and to treat edema caused by using certain medications including estrogen and corticosteroids. Methyclothiazide is in a class of medications called diuretics ('water pills'). It works by causing the kidneys to get rid of unneeded water and salt from the body into the urine.

  • High blood pressure is a common condition and when not treated, can cause damage to the brain, heart, blood vessels, kidneys and other parts of the body. Damage to these organs may cause heart disease, a heart attack, heart failure, stroke, kidney failure, loss of vision, and other problems. In addition to taking medication, making lifestyle changes will also help to control your blood pressure. These changes include eating a diet that is low in fat and salt, maintaining a healthy weight, exercising at least 30 minutes most days, not smoking, and using alcohol in moderation.

See full Methyclothiazide drug information
Keep checking

Other Drugs & Tyramine

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

180Major
1Moderate
171Minor
2,477No known interaction
180 Major 1 Moderate 171 Minor 2,477 No interaction
Major

180 interactions

Showing 60 of 180 major interactions — see all 180 on the Tyramine page.

Moderate

1 interaction

Minor

171 interactions

Showing 60 of 171 minor interactions — see all 171 on the Tyramine page.

No interaction 2,477 drugs checked — show the list

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

Showing the 60 most looked-up of 2,477 medications checked with no known interaction — see the full Tyramine list.

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

Can you take Tyramine with Methyclothiazide?
This is rated a major interaction, so the combination is best avoided unless your doctor or pharmacist has specifically told you otherwise. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Tyramine and Methyclothiazide interaction?
We rate it Major. This is a clinically significant combination that is generally best avoided, or used only under the direct supervision of your physician or pharmacist.

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

Still Have a Question About Methyclothiazide and Tyramine?

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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.