Supplement × Prescription·a caution·Emerging evidence
High-dose quercetin may inhibit CYP3A4 or transporters, potentially increasing tolterodine exposure in some patients.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
What is happening. High-dose quercetin may inhibit CYP3A4 or transporters, potentially increasing tolterodine exposure in some patients.
Mechanism. Potential CYP3A4 and transporter inhibition.
Recommendation. Monitor dry mouth, constipation, urinary retention, blurred vision, palpitations, or dizziness after changes in quercetin use.
Effect on the composite score
If both Quercetin and Tolterodine 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 at /methodology/stack-score.
Every claim on this page is cited. PMIDs link straight to PubMed.
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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.
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