Drug interactions
Liotrix + Metformin-sitagliptin
Severity: Moderate
Liotrix and Metformin-sitagliptin: 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
Liotrix contains levothyroxine and liothyronine, and thyroid hormone can raise blood glucose and increase antidiabetic requirements. Glycemic control may deteriorate after initiation or a dose increase, and hypoglycemia may follow dose reduction.
What this interaction means in plain words
Liotrix and Metformin-sitagliptin 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
Thyroid hormones increase hepatic glucose production and metabolic rate, opposing the glucose-lowering effect (pharmacodynamic antagonism).
What to do
Monitor blood glucose and HbA1c when liotrix is started or its dose is changed. Titrate the antidiabetic therapy accordingly.
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
Frequently asked questions
Can I take Liotrix with Metformin-sitagliptin?
MediHelp rates the interaction as moderate. Liotrix and Metformin-sitagliptin 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. Liotrix contains levothyroxine and liothyronine, and thyroid hormone can raise blood glucose and increase antidiabetic requirements. Glycemic control may deteriorate after initiation or a dose increase, and hypoglycemia may follow dose reduction.
How serious is the interaction between Liotrix and Metformin-sitagliptin?
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 when liotrix is started or its dose is changed. Titrate the antidiabetic therapy accordingly.
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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