Drug interactions
Rifampin + Sorafenib
Severity: Major
Rifampin and Sorafenib: 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
Rifampin can lower sorafenib exposure, which may reduce its antitumor effect. Sorafenib labeling notes that strong CYP3A4 inducers can decrease its concentrations.
What this interaction means in plain words
Rifampin and Sorafenib 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.
Why it happens
Rifampin induces CYP3A4 and UGT1A9 and possibly transporters, increasing sorafenib clearance.
What to do
Avoid the combination where possible and choose an antimycobacterial or alternative agent with no strong induction. If unavoidable, monitor tumor response and tolerability closely.
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 Sorafenib
Frequently asked questions
Can I take Rifampin with Sorafenib?
MediHelp rates the interaction as major. Rifampin and Sorafenib 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. Rifampin can lower sorafenib exposure, which may reduce its antitumor effect. Sorafenib labeling notes that strong CYP3A4 inducers can decrease its concentrations.
How serious is the interaction between Rifampin and Sorafenib?
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 and choose an antimycobacterial or alternative agent with no strong induction. If unavoidable, monitor tumor response and tolerability closely.
What other medicines interact with Sorafenib?
MediHelp also lists interactions of Sorafenib with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Sorafenib page.
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