Drug interactions
Glipizide-metformin + Zonisamide
Severity: Moderate
Glipizide-metformin 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 is a weak carbonic anhydrase inhibitor and can lower serum bicarbonate, causing a non-anion gap hyperchloremic metabolic acidosis. Metformin carries a risk of lactic acidosis, so a pre-existing acidotic tendency may increase the danger of that complication, particularly in patients with renal impairment or hypoxia.
What this interaction means in plain words
Glipizide-metformin 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.
Glipizide-metformin belongs to Endocrine; Zonisamide belongs to Central Nervous System.
Why it happens
Carbonic anhydrase inhibition by zonisamide reduces bicarbonate and adds to the acid-base risk associated with metformin.
What to do
Check baseline and periodic serum bicarbonate and renal function during co-therapy. Reassess the need for metformin or zonisamide if persistent acidosis develops.
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 Glipizide-metformin
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 Glipizide-metformin with Zonisamide?
MediHelp rates the interaction as moderate. Glipizide-metformin 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 is a weak carbonic anhydrase inhibitor and can lower serum bicarbonate, causing a non-anion gap hyperchloremic metabolic acidosis. Metformin carries a risk of lactic acidosis, so a pre-existing acidotic tendency may increase the danger of that complication, particularly in patients with renal impairment or hypoxia.
How serious is the interaction between Glipizide-metformin 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: Check baseline and periodic serum bicarbonate and renal function during co-therapy. Reassess the need for metformin or zonisamide if persistent acidosis develops.
What other medicines interact with Glipizide-metformin?
MediHelp also lists interactions of Glipizide-metformin with, for example, Contrast media, Diatrizoate meglumine / diatrizoate, Diatrizoate. The full list is on the Glipizide-metformin page.
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