Drug interactions
Canagliflozin-metformin + Methylene blue
Severity: Moderate
Canagliflozin-metformin and Methylene blue: 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
Methylene blue has been shown to inhibit renal transporters (MATE1 and OCT2) that eliminate metformin, which may increase metformin exposure. Higher metformin levels raise the risk of lactic acidosis, especially in patients with renal impairment.
What this interaction means in plain words
Canagliflozin-metformin and Methylene blue 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.
Why it happens
Inhibition of renal organic cation transporters (OCT2/MATE) by methylene blue reduces metformin tubular secretion.
What to do
Monitor renal function and for signs of lactic acidosis during methylene blue treatment. Consider temporarily holding metformin or reducing its dose in patients with reduced eGFR.
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 Canagliflozin-metformin
Frequently asked questions
Can I take Canagliflozin-metformin with Methylene blue?
MediHelp rates the interaction as moderate. Canagliflozin-metformin and Methylene blue 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. Methylene blue has been shown to inhibit renal transporters (MATE1 and OCT2) that eliminate metformin, which may increase metformin exposure. Higher metformin levels raise the risk of lactic acidosis, especially in patients with renal impairment.
How serious is the interaction between Canagliflozin-metformin and Methylene blue?
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 renal function and for signs of lactic acidosis during methylene blue treatment. Consider temporarily holding metformin or reducing its dose in patients with reduced eGFR.
What other medicines interact with Canagliflozin-metformin?
MediHelp also lists interactions of Canagliflozin-metformin with, for example, Contrast media, Diatrizoate, Diatrizoate meglumine / diatrizoate. The full list is on the Canagliflozin-metformin page.
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