Drug & supplement interaction

Potassium + Quinapril

Quinapril brand names: Accupril, Accupro.

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

Potassium has a moderate interaction with Quinapril. Using ACEIs with high doses of potassium increases the risk of hyperkalemia.

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

Potassium and Quinapril

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

Moderate

ACE INHIBITORS (ACEIs)

Why this applies to Quinapril

Quinapril falls under ACE INHIBITORS (ACEIs) — the group Potassium interacts with.

Using ACEIs with high doses of potassium increases the risk of hyperkalemia.
ACEIs block the actions of the renin-angiotensin-aldosterone system and reduce potassium excretion. Concomitant use of these drugs with potassium supplements increases the risk of hyperkalemia. However, concomitant use of these drugs with moderate dietary potassium intake (about 3775-5200 mg daily) does not increase serum potassium levels.
Severity Moderate Likelihood Likely Evidence C

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 about Quinapril (Accupri): as an ACE inhibitor, part of how it works is by lowering the activity of a hormone called aldosterone, which normally helps your kidneys get rid of extra potassium. So while you're on Quinapril, your body naturally holds onto a little more potassium than usual.

If you add a concentrated potassium supplement on top of that, the two effects stack up and your potassium can climb too high (a condition called hyperkalemia). That can show up as muscle weakness, tingling, or in serious cases an irregular heartbeat. The reassuring part: normal potassium from food (fruits, veggies) usually isn't a problem. It's the supplement doses that warrant caution. Please check with your pharmacist or doctor before starting any potassium pill or salt substitute.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  2. Phillips, C. O., Kashani, A., Ko, D. K., Francis, G., and Krumholz, H. M. Adverse effects of combination angiotensin II receptor blockers plus angiotensin-converting enzyme inhibitors for left ventricular dysfunction: a quantitative review of data from ra DOI
  3. Malta D, Arcand J, Ravindran A, Floras V, Allard JP, Newton GE. Adequate intake of potassium does not cause hyperkalemia in hypertensive individuals taking medications that antagonize the renin angiotensin aldosterone system. Am J Clin Nutr 2016 Oct;104(4 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

Potassium Also Interacts With Other Medications

Potassium has 61 moderate known drug interactions in our database — the Quinapril one above is one of them. If you take anything else, check it against the full list below.

Moderate 61 No known interaction 2,769 (incl. Quinapril)
Taking anything else?

Check Another of Your Medications Against Potassium

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

From our Q&A

Questions About Potassium or Quinapril

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

This page covers Potassium only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Quinapril 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 Quinapril page

“Quinapril (Accupril) lowers blood pressure by relaxing blood vessels, and that is where most of the 166 supplements and herbs on this list collide with it. The bulk either push its blood-pressure-lowering effect too far or work against it, and with six entries rated major, this page deserves a careful read, not a skim.”

Reviewed by 2 · Jul 18, 2026

Open the Quinapril interaction page

One more smart check

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

We hold 22,782 real supplement products containing Potassium, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Potassium. Your product may carry other ingredients that interact with Quinapril too, on top of Potassium — 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 Potassium and Quinapril 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 Potassium
Top 10

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

29 days ago today
Medication Quinapril
Steady interest

#2,561 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 Potassium

What is Potassium?

  • Preventing or treating low potassium (hypokalemia)
  • Supporting healthy blood pressure
  • Muscle cramps
  • Replacing losses from diuretics or vomiting/diarrhea
  • General electrolyte balance

Potassium is an essential mineral your body needs for nerve signals, muscle function, and a steady heartbeat, and most people get enough from a balanced diet rich in fruits and vegetables. Potassium supplements can help when blood levels are truly low, but too much potassium can be dangerous, especially for people with kidney problems. Always talk with your pharmacist or doctor before taking a potassium supplement.

Read the full Potassium monograph & all interactions
Medication

About Quinapril

What Is Quinapril Used For?

Brand names: Accupril, Accupro

Quinapril tablets are used to treat high blood pressure (hypertension). Lowering blood pressure reduces the risk of stroke and heart attack. Quinapril may be used alone or combined with a thiazide diuretic (water pill) when one medication isn't enough.

Quinapril tablets are also used in the management of heart failure as an add-on therapy alongside other standard treatments such as diuretics and/or digitalis.

See full Quinapril drug information
Keep checking

Other Drugs & Potassium

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

0Major
61Moderate
0Minor
2,768No known interaction
61 Moderate 2,768 No interaction
Moderate

61 interactions

Showing 60 of 61 moderate interactions — see all 61 on the Potassium page.

No interaction 2,768 drugs checked — show the list

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

Showing the 60 most looked-up of 2,768 medications checked with no known interaction — see the full Potassium list.

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

Can you take Potassium with Quinapril?
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 Potassium and Quinapril 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 Quinapril and Potassium?

Our pharmacists answer your medication & supplement questions — free.

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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.