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Supplement × Prescription·Evidence index

Chlorthalidone and Potassium: what the research found

PubMed indexes 8 records that name Chlorthalidone and Potassium together, either in the title or in an interaction, co-administration, or pharmacokinetic context. The key findings come first, in the authors’ own words, followed by every study with its design and PubMed link.

A summary of published research, not medical advice. A pharmacist can check any combination against your full list of medicines and supplements.

Key findings

What the studies concluded.

Reviews and human studies first. Each quote is the authors’ own conclusion about their study, not a NutriStack assessment, and a single study is not a consensus.

“Hydrochlorothiazide, chlorthalidone, and bendroflumethiazide have markedly different potency. This may account for differences in the antihypertensive effect between hydrochlorothiazide and chlorthalidone using standard dose ranges.”

Peterzan et al. · 2012 · Review or meta-analysis · details

“Equivalence analysis using data from several studies suggests that the SBP reductions achieved with HCTZ and chlorthalidone cannot be considered equivalent within the low-dose range currently recommended. However, within this dosing range, reductions in potassium can be considered equivalent.”

Ernst et al. · 2010 · Review or meta-analysis · details

“KMgCit is superior to KCl, the common form of K supplement used in clinical practice, in preventing TD-induced hyperglycemia. This action may improve tolerability and cardiovascular safety in patients with hypertension treated with this drug class.”

The research

8 studies naming Chlorthalidone and Potassium.

Strongest relevance first: papers naming both substances in the title, then human trials and systematic reviews.

Meta-analysis of dose-response relationships for hydrochlorothiazide, chlorthalidone, and bendroflumethiazide on blood pressure, serum potassium, and urate.

Hypertension (Dallas, Tex. : 1979) · 2012 · PMID 22547443

Meta-AnalysisHuman subjects4683 participants

“Hydrochlorothiazide, chlorthalidone, and bendroflumethiazide have markedly different potency. This may account for differences in the antihypertensive effect between hydrochlorothiazide and chlorthalidone using standard dose ranges.”

Peterzan et al. · From the abstract

Names both Chlorthalidone and Potassium in its title.

Meta-analysis of dose-response characteristics of hydrochlorothiazide and chlorthalidone: effects on systolic blood pressure and potassium.

American journal of hypertension · 2010 · PMID 20111008

Meta-AnalysisHuman subjects

“Equivalence analysis using data from several studies suggests that the SBP reductions achieved with HCTZ and chlorthalidone cannot be considered equivalent within the low-dose range currently recommended. However, within this dosing range, reductions in potassium can be considered equivalent.”

Ernst et al. · Authors' conclusion

Names both Chlorthalidone and Potassium in its title.

Potassium Magnesium Citrate Is Superior to Potassium Chloride in Reversing Metabolic Side Effects of Chlorthalidone.

Hypertension (Dallas, Tex. : 1979) · 2023 · PMID 37846572

Randomized Controlled Trial

“KMgCit is superior to KCl, the common form of K supplement used in clinical practice, in preventing TD-induced hyperglycemia. This action may improve tolerability and cardiovascular safety in patients with hypertension treated with this drug class.”

Vongpatanasin et al. · Authors' conclusion

Names both Chlorthalidone and Potassium in its title.

Ramipril decreases chlorthalidone-induced loss of magnesium and potassium in hypertensive patients.

Journal of clinical pharmacology · 1995 · PMID 8750365

Clinical TrialRandomized Controlled Trial

“At the end of the trial these changes were significant in between-group comparisons. Consistent with the previously shown amelioration by ramipril of thiazide-induced metabolic side-effects, ramipril appears to improve magnesium balance during cotreatment with chlorthalidone.”

Simunic et al. · From the abstract

Names both Chlorthalidone and Potassium in its title.

Chlorthalidone-triamterene: a potassium-sparing diuretic combination for the treatment of oedema.

The Journal of international medical research · 1984 · PMID 6376209

Clinical TrialComparative StudyRandomized Controlled Trial

“The decreases in pitting oedema were paralleled by mean weight losses of 2.4 kg and 3.1 kg, respectively, for the combination treatment group and the chlorthalidone group. Average serum potassium levels throughout the 12-week treatment period were 3.70 mEq/L for the patients taking the combination compared to 3.41 mEq/L of those taking chlorthalidone.(ABSTRACT TRUNCATED AT 250 WORDS)”

Webb et al. · From the abstract

Names both Chlorthalidone and Potassium in its title.

Chlorthalidone with potassium citrate decreases calcium oxalate stones and increases bone quality in genetic hypercalciuric stone-forming rats.

Kidney international · 2021 · PMID 33417997

Research Support, N.I.H., ExtramuralAnimal study

“Thus in genetic hypercalciuric stone-forming rats fed a diet resulting in calcium oxalate stone formation, potassium citrate plus chlorthalidone prevented stone formation better than either agent alone. Chlorthalidone alone improved bone quality, but adding potassium citrate provided no additional benefit.”

Krieger et al. · From the abstract

Names both Chlorthalidone and Potassium in its title.

Limitations

What this evidence cannot tell you.

Search-based evidence indexes have real limits, and it is worth being explicit about them:

How to read this page

A literature summary, not guidance.

NutriStack

Track what you actually take.

NutriStack is a free iPhone app for organising a supplement routine: what you take, when, and what the published record says about it. Its exploratory interaction checker covers Chlorthalidone, Potassium, and several hundred other substances.

Log your routine, get reminders at the times you choose, and scan a label to add a product. The checker is a research and organisation tool, not a clinical decision aid.

NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.