Drug interactions
Efgartigimod alfa + Galcanezumab
Severity: Moderate
Efgartigimod alfa 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 protects IgG from degradation. Galcanezumab is an IgG4 monoclonal antibody, so its levels could fall and its migraine-preventive effect could weaken. Clinical data for this specific combination are lacking.
What this interaction means in plain words
Efgartigimod alfa 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 alfa belongs to Miscellaneous; Galcanezumab belongs to Central Nervous System.
Why it happens
FcRn blockade by efgartigimod increases catabolism of IgG-based antibodies such as galcanezumab.
What to do
Monitor migraine control and consider a change in preventive therapy if efficacy declines. Time galcanezumab doses with awareness that efficacy may fall during efgartigimod treatment.
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
Other interactions of Efgartigimod alfa
- Adalimumab + Efgartigimod alfa Moderate
- Ado-trastuzumab + Efgartigimod alfa Moderate
- Basiliximab + Efgartigimod alfa Moderate
- Bevacizumab + Efgartigimod alfa Moderate
- Brentuximab + Efgartigimod alfa Moderate
- Denosumab + Efgartigimod alfa Moderate
Frequently asked questions
Can I take Efgartigimod alfa with Galcanezumab?
MediHelp rates the interaction as moderate. Efgartigimod alfa 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 protects IgG from degradation. Galcanezumab is an IgG4 monoclonal antibody, so its levels could fall and its migraine-preventive effect could weaken. Clinical data for this specific combination are lacking.
How serious is the interaction between Efgartigimod alfa 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 control and consider a change in preventive therapy if efficacy declines. Time galcanezumab doses with awareness that efficacy may fall during efgartigimod treatment.
What other medicines interact with Galcanezumab?
MediHelp also lists interactions of Galcanezumab with, for example, Efgartigimod / hyaluronidase sc, Rozanolixizumab. The full list is on the Galcanezumab page.
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