Is there any drug interaction of Vonaprazan with Metformin? When should Vonaprazan be taken if the patient is on Metformin?
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Vonaprazan (Vonoprazan) + Metformin: Drug Interaction Summary
Is There a Clinically Significant Interaction?
No clinically significant pharmacokinetic drug interaction has been identified between vonoprazan (Voquezna) and metformin.
Here is the reasoning in detail:
Mechanism-Based Analysis
Metformin's elimination pathway is the key concern. Metformin is:
- Not metabolized by CYP enzymes
- Eliminated almost entirely unchanged renally (~90%)
- Depends critically on organic cation transporter 2 (OCT2) for tubular uptake and MATE1/MATE2-K for tubular secretion into urine
Drugs that inhibit OCT2 or MATE1 (e.g., dolutegravir, cimetidine, trimethoprim, vandetanib) reduce renal clearance of metformin and raise plasma concentrations, increasing the risk of lactic acidosis.
Vonoprazan's transporter profile, per the FDA prescribing information (Voquezna label, 2023):
"Vonoprazan inhibits multidrug and toxin extrusion protein 1 (MATE1) and organic cation transporter 1 (OCT1), but only at concentrations higher than clinically relevant."
- OCT2 inhibition: Not demonstrated at clinical concentrations
- MATE1 inhibition: Only supratherapeutic concentrations — not relevant at standard doses
- OCT1 inhibition: Only at supra-clinical concentrations
This is why Drugs.com and clinical interaction checkers report no known interaction between metformin and vonoprazan.
Vonoprazan's CYP-Based Interactions (Not Relevant to Metformin)
Vonoprazan's known CYP interactions involve CYP2B6, CYP2C19, and CYP3A4/5 inhibition in vitro. Since metformin is not a CYP substrate, this is irrelevant to the combination.
When Should Vonoprazan Be Taken If the Patient Is on Metformin?
There is no timing restriction specific to the vonoprazan–metformin combination. Follow the standard dosing rules for each drug independently:
| Drug | Standard Timing |
|---|---|
| Vonoprazan (Voquezna) | Can be taken with or without food. A high-fat meal causes only a ~15% increase in AUC and 2-hour delay in Tmax — not clinically significant. No pre-meal requirement (unlike PPIs, which need 30–60 min before eating). |
| Metformin | Taken with meals to reduce GI side effects (nausea, diarrhea). |
Practical guidance: Vonoprazan can be taken at any time relative to metformin. If both are taken at the same meal, there is no interaction concern. No dose adjustment of metformin is needed.
Important Clinical Caveat
Although vonoprazan itself does not raise metformin levels, acid suppression in general (PPIs, PCABs) can affect the absorption of other co-prescribed drugs. If this patient is also on drugs dependent on gastric pH (e.g., certain antiretrovirals, ketoconazole, iron salts), those interactions should be reviewed separately.
Additionally, per the FDA label, vonoprazan is contraindicated with rilpivirine-containing products (gastric pH dependency).
Summary
- No clinically significant drug interaction exists between vonoprazan and metformin.
- Vonoprazan's MATE1/OCT1 inhibitory potential is only at supratherapeutic concentrations — not a concern at standard doses.
- No special timing is required between the two drugs.
- Take vonoprazan with or without food; take metformin with meals (standard practice).
- No metformin dose adjustment is needed.
Sources: Voquezna (vonoprazan) FDA Prescribing Information (2022/2023) | Yamada's Textbook of Gastroenterology, 7th ed. | FDA label VOQUEZNA | Drugs.com interaction checker
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