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 Berberine + Verapamil pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Interaction databaseSupplement × PrescriptionReviewed May 2026

Berberine and Verapamil, a caution.

Q: Can I take Berberine and Verapamil together?

Possibly, but with caution. Berberine and Verapamil have a documented caution-tier interaction. Verapamil is both a CYP3A4 substrate and a potent P-glycoprotein inhibitor, and berberine inhibits both CYP3A4 and P-gp. Combining the two raises verapamil exposure and slows its clearance, which can trigger bradycardia, AV block, hypotension, or constipation. Because berberine itself is a P-gp substrate, verapamil also raises berberine systemic levels.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored caution row.

Verapamil is both a CYP3A4 substrate and a potent P-glycoprotein inhibitor, and berberine inhibits both CYP3A4 and P-gp. Combining the two raises verapamil exposure and slows its clearance, which can trigger bradycardia, AV block, hypotension, or constipation. Because berberine itself is a P-gp substrate, verapamil also raises berberine systemic levels.

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: Berberine and Verapamil
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. Verapamil is both a CYP3A4 substrate and a potent P-glycoprotein inhibitor, and berberine inhibits both CYP3A4 and P-gp. Combining the two raises verapamil exposure and slows its clearance, which can trigger bradycardia, AV block, hypotension, or constipation. Because berberine itself is a P-gp substrate, verapamil also raises berberine systemic levels.

Mechanism. Berberine inhibits CYP3A4 (the main verapamil-metabolizing enzyme) and intestinal P-gp. Bidirectionally, verapamil inhibits P-gp-mediated efflux of berberine, raising its plasma levels.

Recommendation. Avoid combining berberine with verapamil. If your clinician approves co-use, monitor pulse and blood pressure daily for the first 2 weeks, and report HR below 50 bpm, dizziness, or new constipation. Separate doses by at least 4 hours to limit intestinal interaction.

Minimum separation. 240

Sources (2)

Stack Score

How this pair moves the number.

Effect on the composite score

If both Berberine and Verapamil 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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