Drug interactions
Efgartigimod / hyaluronidase sc + Galcanezumab
Severity: Moderate
Efgartigimod / hyaluronidase sc and Galcanezumab: 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
Efgartigimod blocks the neonatal Fc receptor, which normally recycles IgG and prolongs its half-life. Galcanezumab is an IgG4 antibody, so exposure and migraine prevention could be reduced. Clinical data for the combination are lacking.
What this interaction means in plain words
Efgartigimod / hyaluronidase sc and Galcanezumab 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
FcRn blockade by efgartigimod accelerates degradation of IgG-based antibodies such as galcanezumab.
What to do
Monitor migraine frequency and consider an alternative non-antibody preventive if control worsens. Review the need for continued galcanezumab during efgartigimod therapy.
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 Galcanezumab
- Efgartigimod alfa + Galcanezumab Moderate
- Galcanezumab + Rozanolixizumab Moderate
Frequently asked questions
Can I take Efgartigimod / hyaluronidase sc with Galcanezumab?
MediHelp rates the interaction as moderate. Efgartigimod / hyaluronidase sc and Galcanezumab 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. Efgartigimod blocks the neonatal Fc receptor, which normally recycles IgG and prolongs its half-life. Galcanezumab is an IgG4 antibody, so exposure and migraine prevention could be reduced. Clinical data for the combination are lacking.
How serious is the interaction between Efgartigimod / hyaluronidase sc and Galcanezumab?
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 migraine frequency and consider an alternative non-antibody preventive if control worsens. Review the need for continued galcanezumab during efgartigimod therapy.
What other medicines interact with Galcanezumab?
MediHelp also lists interactions of Galcanezumab with, for example, Efgartigimod alfa, Rozanolixizumab. The full list is on the Galcanezumab page.
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