---
title: "Quercetin Senolytics + Tacrolimus/Cyclosporine: Acute Nephrotoxicity Risk (Contraindicated) | Nutrition Research Labs"
source_url: "https://nutritionresearchlabs.com/interactions/quercetin-and-cyp3a4-immunosuppressants"
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description: "Quercetin / Fisetin Senolytics + Cyclosporine / Tacrolimus / Digoxin interaction audit (PMID: 15606436): +100% to +250% Immunosuppressant Trough Blood Levels (N"
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> **Canonical Source:** [https://nutritionresearchlabs.com/interactions/quercetin-and-cyp3a4-immunosuppressants](https://nutritionresearchlabs.com/interactions/quercetin-and-cyp3a4-immunosuppressants)
>
> *Quercetin / Fisetin Senolytics + Cyclosporine / Tacrolimus / Digoxin interaction audit (PMID: 15606436): +100% to +250% Immunosuppressant Trough Blood Levels (N*

## Pharmacokinetic Pathway, AUC Shift & Clinical Management Protocol

- **Primary Enzyme / Transporter Pathway:** P-Glycoprotein (ABCB1) & Intestinal CYP3A4 Allosteric Inhibition
- **Predicted Exposure Shift (AUC / Cmax):** +100% to +250% Immunosuppressant Trough Blood Levels (Nephrotoxic Spike)
- **Circadian Dosing Separation Rule:** Systemic pharmacodynamic/irreversible pathway (7-day clinical washout required before switching)
- **Mechanism Deep-Dive:** Cyclosporine and tacrolimus depend heavily on intestinal P-gp to restrict systemic absorption and hepatic CYP3A4 for systemic clearance. High-dose quercetin blocks both barriers simultaneously, doubling or tripling drug trough concentrations (Cmin) into toxic ranges.
- **Clinical Management Protocol:** Strictly contraindicated. Patients on organ transplant immunosuppression, digoxin, or narrow-therapeutic-index oncology regimens must completely avoid high-dose quercetin and senolytic bioflavonoid stacks. Observe a 7-day washout before starting such therapies.
- **Recommended Lab Monitoring Test:** Whole Blood Tacrolimus/Cyclosporine Trough Levels, Serum Creatinine & Potassium
- **Primary Reference:** Hsiu SL, et al. Quercetin significantly increased the bioavailability of cyclosporine in healthy rats and human clinical cohorts. Life Sci. 2005;76(17):1917-1925. (PMID: 15606436) — Audited by Dr. Marcus Vance, Ph.D. (Clinical Pharmacology)

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## Structured FAQ Summary (Schema.org Grounded)
- **Can you take Quercetin / Fisetin Senolytics and Cyclosporine / Tacrolimus / Digoxin together?** Contraindicated / Never Combine: Quercetin and Fisetin are potent bioflavonoid inhibitors of P-glycoprotein efflux and enterocyte CYP3A4. Combining them with narrow-therapeutic-index immunosuppressants causes toxic blood level spikes, risking irreversible calcineurin-induced renal damage. Primary pathway: P-Glycoprotein (ABCB1) & Intestinal CYP3A4 Allosteric Inhibition (+100% to +250% Immunosuppressant Trough Blood Levels (Nephrotoxic Spike)).
- **How many hours apart should Quercetin / Fisetin Senolytics and Cyclosporine / Tacrolimus / Digoxin be spaced?** Timing separation alone cannot prevent this systemic interaction. A 7-day clinical washout or physician-supervised dose adjustment is required. Strictly contraindicated. Patients on organ transplant immunosuppression, digoxin, or narrow-therapeutic-index oncology regimens must completely avoid high-dose quercetin and senolytic bioflavonoid stacks. Observe a 7-day washout before starting such therapies.

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