What kind of interaction is it?

Caution: an interaction that may reduce efficacy or raise side-effect risk and warrants monitoring.

Is this interaction backed by published research?

Yes. NutriStack lists 2 citation rows for the Chlorthalidone + L-Arginine pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Interaction databaseSupplement × PrescriptionReviewed May 2026

Chlorthalidone and L-Arginine, a caution.

Q: Can I take Chlorthalidone and L-Arginine together?

Possibly, but with caution. Chlorthalidone and L-Arginine have a documented caution-tier interaction. L-Arginine can lower blood pressure, and chlorthalidone is a long-acting antihypertensive diuretic. Combining them can produce additive blood-pressure lowering, especially in people already controlled on chlorthalidone or prone to dehydration. Symptoms can include dizziness, weakness, headache, or fainting.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored caution row.

L-Arginine can lower blood pressure, and chlorthalidone is a long-acting antihypertensive diuretic. Combining them can produce additive blood-pressure lowering, especially in people already controlled on chlorthalidone or prone to dehydration. Symptoms can include dizziness, weakness, headache, or fainting.

2 primary source citations. Moderate evidence. Last verified May 30, 2026.

Open the interaction checker →Read the methodology

One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.

Sourcing standards·Evidence tiers

From the interaction database

What the row says.

Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.

At a glance

Substances: Chlorthalidone and L-Arginine
Pair type: Caution
Evidence (highest tier): Moderate
Source citations: 2 sources
Stack Score effect: −5 to your Stack Score (per scored caution row).
Scope: Supplement × Prescription
Last verified: May 30, 2026

Caution · Moderate evidence

Caution

What is happening. L-Arginine can lower blood pressure, and chlorthalidone is a long-acting antihypertensive diuretic. Combining them can produce additive blood-pressure lowering, especially in people already controlled on chlorthalidone or prone to dehydration. Symptoms can include dizziness, weakness, headache, or fainting.

Mechanism. L-Arginine increases nitric oxide substrate availability and vasodilation. Chlorthalidone lowers blood pressure through natriuresis and sustained vascular effects, so the combination can have additive hemodynamic effects.

Recommendation. Start L-Arginine cautiously if you take chlorthalidone and monitor home blood pressure for 1-2 weeks. Stop or lower the supplement and contact your prescriber if you develop lightheadedness, fainting, or consistently low readings.

Sources (2)

Stack Score

How this pair moves the number.

Effect on the composite score

If both Chlorthalidone and L-Arginine are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).

The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.

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