Drug interactions
Brigatinib + Levonorgestrel
Severity: Major
Brigatinib and Levonorgestrel: 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
Brigatinib may lower hormonal contraceptive concentrations and lead to loss of contraceptive efficacy. Pregnancy during brigatinib therapy is a concern because of fetal harm.
What this interaction means in plain words
Brigatinib and Levonorgestrel 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.
Brigatinib belongs to Oncology; Levonorgestrel belongs to Endocrine.
Why it happens
Brigatinib induces CYP3A4, accelerating levonorgestrel metabolism.
What to do
Use an effective non-hormonal contraceptive during treatment and for at least 4 months after the last dose.
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 Levonorgestrel
Other interactions of Brigatinib
Frequently asked questions
Can I take Brigatinib with Levonorgestrel?
MediHelp rates the interaction as major. Brigatinib and Levonorgestrel 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. Brigatinib may lower hormonal contraceptive concentrations and lead to loss of contraceptive efficacy. Pregnancy during brigatinib therapy is a concern because of fetal harm.
How serious is the interaction between Brigatinib and Levonorgestrel?
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 an effective non-hormonal contraceptive during treatment and for at least 4 months after the last dose.
What other medicines interact with Levonorgestrel?
MediHelp also lists interactions of Levonorgestrel with, for example, Amobarbital, Apalutamide, Belzutifan. The full list is on the Levonorgestrel page.
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