NutriStack
Alfuzosin and L-Arginine, a caution.
L-Arginine can reduce blood pressure through nitric oxide production. Alfuzosin is generally uroselective but still has clinically relevant blood-pressure considerations, particularly in patients also using antihypertensives. Combining them can cause dizziness or low blood pressure in susceptible users.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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At a glance
- Substances
- Alfuzosin 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 reduce blood pressure through nitric oxide production. Alfuzosin is generally uroselective but still has clinically relevant blood-pressure considerations, particularly in patients also using antihypertensives. Combining them can cause dizziness or low blood pressure in susceptible users.
Mechanism. L-Arginine increases endothelial nitric oxide synthesis and vasodilation. Alfuzosin blocks alpha1 receptors and can reduce vascular resistance, so their effects can add even though the drugs act through different pathways.
Recommendation. If you take alfuzosin, start L-arginine at a low dose and monitor blood pressure for 1-2 weeks. Reduce or stop L-arginine if you become lightheaded, unusually fatigued, or your readings fall below your usual range.
Sources (2)
- Zhang LT, Lee SW, Park K, Chung WS, Kim SW, Hyun JS, Moon DG, Yang SK. Multicenter, prospective, comparative cohort study evaluating the efficacy and safety of alfuzosin 10 mg with regard to blood pressure in men with lower urinary tract symptoms suggestive of benign prostatic hyperplasia with or without antihypertensive medications. Clin Interv Aging. 2015;10:277-286. PMID 25653511
- Dong JY, Qin LQ, Zhang Z, Zhao Y, Wang J, Arigoni F, Zhang W. Effect of oral L-arginine supplementation on blood pressure: a meta-analysis of randomized, double-blind, placebo-controlled trials. Am Heart J. 2011;162(6):959-965. PMID 22137067
Stack Score
How this pair moves the number.
Effect on the composite score
If both Alfuzosin 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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