Drug interactions
Hydroxycarbamide + Natalizumab
Severity: Major
Hydroxycarbamide and Natalizumab: major interaction.
Last updated Sources: US FDA label
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
Hydroxyurea is myelosuppressive and natalizumab impairs immune surveillance, so together they may raise the risk of serious and opportunistic infections. Natalizumab labeling advises against combining it with immunosuppressants or antineoplastics.
What this interaction means in plain words
Hydroxycarbamide and Natalizumab can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Hydroxycarbamide belongs to Oncology; Natalizumab belongs to Gastrointestinal Tract.
Why it happens
Additive immunosuppression from bone marrow suppression (hydroxyurea) and inhibition of lymphocyte migration (natalizumab).
What to do
Avoid the combination where possible. If unavoidable, monitor blood counts regularly and watch for infection and PML symptoms.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Natalizumab
- Natalizumab + Vedolizumab Contraindicated
- Axicabtagene ciloleucel + Natalizumab Major
- Baricitinib + Natalizumab Major
- Belatacept + Natalizumab Major
- Brexucabtagene autoleucel + Natalizumab Major
- Cabazitaxel + Natalizumab Major
Other interactions of Hydroxycarbamide
- Didanosine + Hydroxycarbamide Contraindicated
- Hydroxycarbamide + Stavudine Contraindicated
- Adenovirus types 4 and 7 live + Hydroxycarbamide Major
- Axicabtagene ciloleucel + Hydroxycarbamide Major
- Bcg intravesical live + Hydroxycarbamide Major
- Bcg vaccine live + Hydroxycarbamide Major
Frequently asked questions
Can I take Hydroxycarbamide with Natalizumab?
MediHelp rates the interaction as major. Hydroxycarbamide and Natalizumab can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Hydroxyurea is myelosuppressive and natalizumab impairs immune surveillance, so together they may raise the risk of serious and opportunistic infections. Natalizumab labeling advises against combining it with immunosuppressants or antineoplastics.
How serious is the interaction between Hydroxycarbamide and Natalizumab?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination where possible. If unavoidable, monitor blood counts regularly and watch for infection and PML symptoms.
What other medicines interact with Natalizumab?
MediHelp also lists interactions of Natalizumab with, for example, Vedolizumab, Axicabtagene ciloleucel, Baricitinib. The full list is on the Natalizumab page.
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