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Dietary supplement

Potassium Caplets, 99 mg Ingredients & Drug Interactions

by Member's Mark

Potassium Caplets, 99 mg label
See full label image
Other (e.g. Tea Bag) Category: Mineral
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Potassium Caplets, 99 mg against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Potassium Caplets, 99 mg is a dietary supplement by Member's Mark with 1 active ingredient. Its ingredients are commonly taken for preventing or treating low potassium (hypokalemia), supporting healthy blood pressure, muscle cramps.Based on those ingredients, 62 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Potassium. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Potassium Caplets, 99 mg by Member's Mark

Ask about any prescription or over-the-counter medication and we check it for interactions with Potassium Caplets, 99 mg by Member's Mark — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Potassium Caplets, 99 mg by Member's Mark

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Sep 3, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains one active ingredient: potassium, a mineral your body needs for nerve and muscle function, including your heartbeat. The caplet also includes cellulose as an inactive ingredient.

Does it work?

Couldn't assess
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Not assessable

We hold no graded evidence for this product's ingredients for its stated purpose.

Why this rating?
  • The label markets this product for: supports normal fluid balance and nerve transmission.
  • We looked for evidence on: electrolyte balance, hypokalemia, muscle function.
  • Our graded evidence for these ingredients doesn't cover that particular purpose.

No effectiveness ratings are available in our data for potassium supplementation. Potassium's role in body function is well established, but we don't hold evidence on whether this specific dosage or form improves any particular health outcome.

The evidence, ingredient by ingredient Potassium

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Potassium from food is safe for everyone, but supplements are a different story. They're generally well tolerated when you take them by mouth, but they can cause high potassium levels (hyperkalemia) in some people—especially those with kidney disease—and that's dangerous.

Common side effects include abdominal pain, belching, diarrhea, gas, nausea, and vomiting. Rarely, high potassium can cause heart rhythm problems, low blood pressure, or confusion.

For pregnancy, dietary potassium is fine, but talk with your doctor before using a potassium supplement—the data advises they're likely safe, yet supplements need medical guidance during pregnancy. The same goes for breastfeeding: check with your doctor first.

If you have kidney disease, heart disease, or take a blood pressure or diuretic medication, you especially need to clear this with your own pharmacist or doctor before starting.

Side effects, ingredient by ingredient Potassium

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Potassium.
  • The most serious interaction on file is rated Moderate.
  • For scale: 62 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before taking this product, make sure to check with your own doctor or pharmacist if you take potassium-sparing diuretics (water pills that keep potassium in your body), ACE inhibitors (blood pressure drugs), or angiotensin receptor blockers (ARBs—another blood pressure drug class). All three raise your risk of dangerously high blood potassium.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no assessable stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

This supplement is straightforward—one ingredient, potassium—but it's not a casual add-on. If you take any blood pressure medication, water pill, or have kidney problems, you need to check with your own doctor or pharmacist before starting.

Even if none of those apply, potassium levels matter, and this shouldn't be used without reason or without knowing your baseline potassium is low.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Jun 25, 2015.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Potassium Caplets, 99 mg, straight from the product label.

Brand Member's Mark
Barcode (UPC) 078742094038
Net contents 500 Caplet(s)
Market status On market
Date entered into DSLD Jun 25, 2015
DSLD ID 46330
Product type Mineral
Supplement form Other (e.g. Tea Bag)
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Gluten Free, Dairy Free, Sugar Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Potassium Caplets, 99 mg by Member's Mark, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 Caplet(s)
Maximum serving Sizes:
1 Caplet(s)
UPC/BARCODE
078742094038
IngredientAmount% DV
Potassium99 mg3%

Other ingredients: Cellulose, Contains <2% of

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
General Statements

Supports Normal Fluid Balance*

{Caplet} actual size

- Helps maintain normal fluid balance* - Supports nerve transmission* - Helps maintain healthy cell function*

Health Benefits Wellness*

As a reminder, discuss the supplements and medications you take with your health care providers.

100% MONEY BACK GUARANTEE SUPERIOR QUALITY AND PERFORMANCE

We would like to hear from you with any comments or suggestions. In the continental U.S. or Canada, you can call us at 1-888-667-8678 from 8 a.m. to 5 p.m. CST Monday - Friday.

NUTRITION INFORMATION: Potassium is one of the important minerals that helps maintain fluid balance and nerve health.*

Prod. No. 58868 B51486 00A

Seals/Symbols

M Member's Mark(R) QUALITY GUARANTEED

GLUTEN FREE

LABORATORY TESTED - QUALITY ASSURED

FDA Statement of Identity

dietary supplement

Suggested/Recommended/Usage/Directions

Suggested Use: For adults, take one (1) caplet daily, preferably with a meal.

Precautions

WARNING: If you are pregnant, nursing, taking any medications or have any medical condition, consult your doctor before use.

Discontinue use and consult your doctor if any adverse reactions occur.

KEEP OUT OF THE REACH OF CHILDREN.

Tamper resistant: Do not use if seal under cap is broken or missing.

FDA Disclaimer Statement

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

Storage

Store at room temperature, tightly closed and avoid excessive heat.

Formulation

No gluten No yeast No wheat No milk or milk derivatives No lactose No sugar No preservatives No soy No artificial color No artificial flavor

GLUTEN FREE

Formula

No sodium (less than 5 mg per serving).

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Potassium Caplets, 99 mg by Member's Mark label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Potassium Caplets, 99 mg label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Potassium Caplets, 99 mg by Member's Mark

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size1 Caplet(s) Dosage formOther (e.g. Tea Bag) Amounts shown are per serving.

Potassium

Interacts with
62 drugs
99 mg per serving Form: Potassium Gluconate

Potassium is an essential mineral your body needs for nerve signals, muscle function, and a steady heartbeat, and most people get enough from a balanc...

Potassium monograph & interactions

Other (inactive) ingredients: Cellulose, Contains <2% of. These complete the product’s ingredient list but are not active constituents.

Interaction report

Potassium Caplets, 99 mg by Member's Mark Drug Interactions

Want to check YOUR meds against Potassium Caplets, 99 mg?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
62Drugs
62 Moderate

Ingredients driving the most interactions

Potassium 62

Individual Drug Interactions

The ingredients in Potassium Caplets, 99 mg interact with 62 drugs. Click any drug to see the details.

1 of the 1 ingredient in Potassium Caplets, 99 mg interact with drugs. Each result below shows which ingredient is responsible. Potassium

Each ingredient & the kinds of drugs it affects

For each ingredient in Potassium Caplets, 99 mg with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Potassium3 drug types · 62 drugs

Ace Inhibitors (Aceis)

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.

Likelihood Likely Evidence C
Angiotensin Receptor Blockers (Arbs)

Using ARBs with high doses of potassium increases the risk of hyperkalemia.
ARBs 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.

Likelihood Likely Evidence C
Potassium-Sparing Diuretics

Concomitant use increases the risk of hyperkalemia.
Using potassium-sparing diuretics with potassium supplements increases the risk of hyperkalemia.

Likelihood Likely Evidence C
Potassium full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Potassium Caplets, 99 mg, from the product label.

Member's Mark

Name
SAM'S WEST, INC.
City
BENTONVILLE
State
AR
ZipCode
72716
Pharmacist Counseling Corner

Potassium Caplets, 99 mg by Member's Mark: Common Questions

Does Potassium Caplets, 99 mg by Member's Mark interact with any medications?
Yes. Based on its ingredients, Potassium Caplets, 99 mg has a known interaction with 62 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Potassium Caplets, 99 mg contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
What does potassium do?
Potassium is a mineral your body uses for nerve signals and muscle function, including controlling your heartbeat. Your body normally gets it from food like bananas, beans, and leafy greens.
Can I take this while pregnant or breastfeeding?
Dietary potassium is fine during pregnancy and breastfeeding, but supplements are different. The data indicates they're likely safe during pregnancy, yet you should talk with your doctor before using a supplement—same goes for breastfeeding. Supplements need medical guidance in both situations.
What side effects might I have?
Most people tolerate potassium well by mouth. Common side effects are stomach upset—pain, nausea, vomiting, diarrhea, or gas. Rarely, high potassium levels can cause serious problems like heart rhythm changes, low blood pressure, or confusion.
Is potassium safe if I have kidney disease?
Not without medical supervision. Your kidneys control potassium levels, so if they're not working well, this supplement can dangerously raise your blood potassium. Talk with your doctor or pharmacist before taking it.
What's in this besides potassium?
The caplet contains cellulose, which is an inactive ingredient (a filler or binder that holds the tablet together). Potassium is the only active ingredient.
Do I really need a potassium supplement?
Most people get enough potassium from food. Supplements are typically used only when a blood test shows your potassium is low, or when you're on a medication that depletes it. Check with your doctor to see if you actually need one.

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

Not sure if Potassium Caplets, 99 mg is safe with your meds?

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Ask a pharmacist

Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Potassium Caplets, 99 mg label
Go deeper

The Full Monographs Behind Potassium Caplets, 99 mg’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Potassium

Interacts with 62 drugs

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. P...

Read the full Potassium monograph →
Sources

Sources & How We Checked

Potassium Caplets, 99 mg's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 12 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Potassium 12 references
  1. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  2. Gennaro A. Remington: The Science and Practice of Pharmacy. 19th ed. Lippincott: Williams & Wilkins, 1996.
  3. Whelton PK, He J, Cutler JA, et al. Effects of oral potassium on blood pressure. Meta-analysis of randomized controlled clinical trials. JAMA 1997;277:1624-32. PubMed
  4. 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
  5. Altieri, P. I., Herrero, C., Suero, R., and Ortiz, A. Bleeding duodenal ulcer in a patient taking slow-releasing potassium tablets. Bol.Asoc.Med P.R. 1977;69(8):276.
  6. Raf, L. E. Enteric-coated potassium chloride tablets and ulcer of the small intestine. Acta Chir Scand Suppl 1967;(374):1-87.
  7. Potassium chloride oral solution [package insert]. Allentown, PA: Lehigh Valley Technologies, Inc.; 2014.
  8. Potassium chloride injection [package insert]. Lake Forest, IL: Hospira Inc.; 2009.
  9. Patel RB, Tannenbaum S, Viana-Tejedor A, et al. Serum potassium levels, cardiac arrhythmias, and mortality following non-ST-elevation myocardial infarction or unstable angina: insights from MERLIN-TIMI 36. Eur Heart J Acute Cardiovasc Care 2017 Feb;6(1):1 PubMed
  10. 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
  11. Keskin M, Kaya A, Tatlisu MA, et al. The effect of serum potassium level on in-hospital and long-term mortality in ST elevation myocardial infarction. Int J cardiol. 2016 Oct 15;221:505-10.
  12. Stallings VA, Harrison M, Oria M; Committee to Review the Dietary Reference Intakes for Sodium and Potassium, Food and Nutrition Board, Health and Medicine Division, National Academies of Sciences, Engineering, and Medicine. Washington (DC): National Acad

See these in context on the Potassium monograph →

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

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