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 Hydrochlorothiazide + 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

Hydrochlorothiazide and L-Arginine, a caution.

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

Possibly, but with caution. Hydrochlorothiazide and L-Arginine have a documented caution-tier interaction. L-Arginine can lower blood pressure through nitric-oxide-mediated vasodilation. Hydrochlorothiazide is an antihypertensive diuretic, so adding L-Arginine can drop blood pressure further than intended in some people. This is most relevant if your blood pressure is already at goal, you are older, dehydrated, or taking multiple blood-pressure medicines.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored caution row.

L-Arginine can lower blood pressure through nitric-oxide-mediated vasodilation. Hydrochlorothiazide is an antihypertensive diuretic, so adding L-Arginine can drop blood pressure further than intended in some people. This is most relevant if your blood pressure is already at goal, you are older, dehydrated, or taking multiple blood-pressure medicines.

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: Hydrochlorothiazide 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 through nitric-oxide-mediated vasodilation. Hydrochlorothiazide is an antihypertensive diuretic, so adding L-Arginine can drop blood pressure further than intended in some people. This is most relevant if your blood pressure is already at goal, you are older, dehydrated, or taking multiple blood-pressure medicines.

Mechanism. L-Arginine is a substrate for endothelial nitric oxide synthase, increasing nitric oxide signaling and vasodilation. Hydrochlorothiazide lowers blood pressure through natriuresis and longer-term vascular effects, so the effects can be additive.

Recommendation. Start L-Arginine at a low dose if you take hydrochlorothiazide and monitor home blood pressure for 1-2 weeks. Reduce or stop it and contact your prescriber if you develop lightheadedness, fainting, unusual fatigue, or readings below your usual range.

Sources (2)

Stack Score

How this pair moves the number.

Effect on the composite score

If both Hydrochlorothiazide 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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