Drug interactions
Levothyroxine + Ropeginterferon alfa 2b
Severity: Moderate
Levothyroxine and Ropeginterferon alfa 2b: 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
Interferons can cause thyroid dysfunction, including autoimmune thyroiditis, hypothyroidism and hyperthyroidism. This can change levothyroxine requirements, and the CYP suppression cited for interferons is not a meaningful route for levothyroxine, which is not primarily CYP-metabolized.
What this interaction means in plain words
Levothyroxine and Ropeginterferon alfa 2b 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
Interferon-induced thyroid autoimmunity and thyroid dysfunction alters thyroid hormone requirements; this is a pharmacodynamic rather than a pharmacokinetic effect.
What to do
Measure TSH before starting interferon therapy and periodically during treatment. Adjust the levothyroxine dose according to results.
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 Levothyroxine
Frequently asked questions
Can I take Levothyroxine with Ropeginterferon alfa 2b?
MediHelp rates the interaction as moderate. Levothyroxine and Ropeginterferon alfa 2b 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. Interferons can cause thyroid dysfunction, including autoimmune thyroiditis, hypothyroidism and hyperthyroidism. This can change levothyroxine requirements, and the CYP suppression cited for interferons is not a meaningful route for levothyroxine, which is not primarily CYP-metabolized.
How serious is the interaction between Levothyroxine and Ropeginterferon alfa 2b?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Measure TSH before starting interferon therapy and periodically during treatment. Adjust the levothyroxine dose according to results.
What other medicines interact with Levothyroxine?
MediHelp also lists interactions of Levothyroxine with, for example, Cholestyramine, Sodium iodide i-131, Tiratricol. The full list is on the Levothyroxine page.
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