Drug interactions
Isoniazid + Mobocertinib
Severity: Major
Isoniazid and Mobocertinib: 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
Mobocertinib is metabolized by CYP3A4 and causes dose-related QTc prolongation and serious arrhythmias. Isoniazid may modestly raise its exposure, increasing QT risk.
What this interaction means in plain words
Isoniazid and Mobocertinib 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
Weak CYP3A4 inhibition by isoniazid may raise mobocertinib levels, adding to its QT-prolonging effect.
What to do
Monitor ECG and electrolytes, and consider an alternative to isoniazid where feasible. Reduce or hold mobocertinib per labeling if QTc lengthens.
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 Isoniazid
Frequently asked questions
Can I take Isoniazid with Mobocertinib?
MediHelp rates the interaction as major. Isoniazid and Mobocertinib 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. Mobocertinib is metabolized by CYP3A4 and causes dose-related QTc prolongation and serious arrhythmias. Isoniazid may modestly raise its exposure, increasing QT risk.
How serious is the interaction between Isoniazid and Mobocertinib?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor ECG and electrolytes, and consider an alternative to isoniazid where feasible. Reduce or hold mobocertinib per labeling if QTc lengthens.
What other medicines interact with Isoniazid?
MediHelp also lists interactions of Isoniazid with, for example, Bacillus calmette-guerin substrain tice, Benzhydrocodone / acetaminophen, Carbamazepine. The full list is on the Isoniazid page.
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