Drug interactions
Metformin-sitagliptin + Tolbutamide
Severity: Moderate
Metformin-sitagliptin and Tolbutamide: 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
Combining a sulfonylurea with a DPP-4 inhibitor and metformin increases the risk of hypoglycemia, since tolbutamide stimulates insulin secretion regardless of glucose level and sitagliptin enhances glucose-dependent insulin release. The risk is greatest in elderly patients and those with renal impairment.
What this interaction means in plain words
Metformin-sitagliptin and Tolbutamide 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-sitagliptin belongs to Endocrine; Tolbutamide belongs to Endocrine.
Why it happens
Additive glucose-lowering effects through complementary insulin secretagogue actions.
What to do
Consider reducing the sulfonylurea dose when adding sitagliptin and counsel patients on recognizing hypoglycemia. Monitor blood glucose regularly.
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-sitagliptin
Other interactions of Tolbutamide
- Glyburide-metformin + Tolbutamide Major
- Insulin degludec-liraglutide + Tolbutamide Major
- Aceclofenac + Tolbutamide Moderate
- Acemetacin + Tolbutamide Moderate
- Acetylsalicylic acid + Tolbutamide Moderate
- Albiglutide + Tolbutamide Moderate
Frequently asked questions
Can I take Metformin-sitagliptin with Tolbutamide?
MediHelp rates the interaction as moderate. Metformin-sitagliptin and Tolbutamide 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. Combining a sulfonylurea with a DPP-4 inhibitor and metformin increases the risk of hypoglycemia, since tolbutamide stimulates insulin secretion regardless of glucose level and sitagliptin enhances glucose-dependent insulin release. The risk is greatest in elderly patients and those with renal impairment.
How serious is the interaction between Metformin-sitagliptin and Tolbutamide?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Consider reducing the sulfonylurea dose when adding sitagliptin and counsel patients on recognizing hypoglycemia. Monitor blood glucose regularly.
What other medicines interact with Metformin-sitagliptin?
MediHelp also lists interactions of Metformin-sitagliptin with, for example, Clozapine, Contrast media, Diatrizoate meglumine / diatrizoate. The full list is on the Metformin-sitagliptin page.
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