Drug interactions
Clarithromycin + Erdafitinib
Severity: Major
Clarithromycin and Erdafitinib: major 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
Strong CYP3A4 inhibitors increase erdafitinib exposure, raising the risk of adverse effects such as hyperphosphatemia, stomatitis and ocular toxicity.
What this interaction means in plain words
Clarithromycin and Erdafitinib 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.
Clarithromycin belongs to Anti Bacterial; Erdafitinib belongs to Oncology.
Why it happens
Clarithromycin inhibits CYP3A4, which contributes to erdafitinib metabolism along with CYP2C9.
What to do
Use a non-CYP3A4-inhibiting antibiotic where possible. If unavoidable, monitor closely for erdafitinib toxicity and reduce the dose as needed, then reassess after clarithromycin is stopped.
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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Other interactions of Clarithromycin
- Astemizole + Clarithromycin Contraindicated
- Avanafil + Clarithromycin Contraindicated
- Cisapride + Clarithromycin Contraindicated
- Clarithromycin + Colchicine Contraindicated
- Clarithromycin + Conivaptan Contraindicated
- Clarithromycin + Dihydroergotamine Contraindicated
Other interactions of Erdafitinib
Frequently asked questions
Can I take Clarithromycin with Erdafitinib?
MediHelp rates the interaction as major. Clarithromycin and Erdafitinib 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. Strong CYP3A4 inhibitors increase erdafitinib exposure, raising the risk of adverse effects such as hyperphosphatemia, stomatitis and ocular toxicity.
How serious is the interaction between Clarithromycin and Erdafitinib?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use a non-CYP3A4-inhibiting antibiotic where possible. If unavoidable, monitor closely for erdafitinib toxicity and reduce the dose as needed, then reassess after clarithromycin is stopped.
What other medicines interact with Clarithromycin?
MediHelp also lists interactions of Clarithromycin with, for example, Astemizole, Avanafil, Cisapride. The full list is on the Clarithromycin page.
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