Drug interactions
Levothyroxine + Metformin-pioglitazone
Severity: Moderate
Levothyroxine and Metformin-pioglitazone: 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
Thyroid hormone increases glucose production and metabolic rate, which can worsen glycemic control in people with diabetes. Dose changes in either drug may therefore alter glucose levels.
What this interaction means in plain words
Levothyroxine and Metformin-pioglitazone 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.
Levothyroxine belongs to Endocrine; Metformin-pioglitazone belongs to Endocrine.
Why it happens
Thyroid hormone raises hepatic glucose output and gut glucose absorption, opposing antidiabetic effects.
What to do
Monitor blood glucose and HbA1c after starting or changing levothyroxine doses, and adjust antidiabetic therapy as needed.
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 Levothyroxine
Frequently asked questions
Can I take Levothyroxine with Metformin-pioglitazone?
MediHelp rates the interaction as moderate. Levothyroxine and Metformin-pioglitazone 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. Thyroid hormone increases glucose production and metabolic rate, which can worsen glycemic control in people with diabetes. Dose changes in either drug may therefore alter glucose levels.
How serious is the interaction between Levothyroxine and Metformin-pioglitazone?
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 blood glucose and HbA1c after starting or changing levothyroxine doses, and adjust antidiabetic therapy as needed.
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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