Drug interactions
Metformin-pioglitazone + Zonisamide
Severity: Moderate
Metformin-pioglitazone and Zonisamide: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Zonisamide can lower serum bicarbonate and cause metabolic acidosis, which may add to the lactic acidosis risk with metformin in susceptible patients.
What this interaction means in plain words
Metformin-pioglitazone and Zonisamide can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Metformin-pioglitazone belongs to Endocrine; Zonisamide belongs to Central Nervous System.
Why it happens
Carbonic anhydrase inhibition causes hyperchloremic metabolic acidosis, additive to metformin-associated acidosis risk.
What to do
Monitor serum bicarbonate at baseline and periodically; reassess metformin if persistent acidosis occurs.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Metformin-pioglitazone
Other interactions of Zonisamide
- Zonisamide + Zuranolone Major
- Acetazolamide + Zonisamide Moderate
- Amisulpride + Zonisamide Moderate
- Amobarbital + Zonisamide Moderate
- Apalutamide + Zonisamide Moderate
- Asenapine transdermal + Zonisamide Moderate
Frequently asked questions
Can I take Metformin-pioglitazone with Zonisamide?
MediHelp rates the interaction as moderate. Metformin-pioglitazone and Zonisamide can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Zonisamide can lower serum bicarbonate and cause metabolic acidosis, which may add to the lactic acidosis risk with metformin in susceptible patients.
How serious is the interaction between Metformin-pioglitazone and Zonisamide?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum bicarbonate at baseline and periodically; reassess metformin if persistent acidosis occurs.
What other medicines interact with Metformin-pioglitazone?
MediHelp also lists interactions of Metformin-pioglitazone with, for example, Contrast media, Diatrizoate meglumine / diatrizoate, Diatrizoate. The full list is on the Metformin-pioglitazone page.
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