Drug interactions
Selpercatinib + Tolebrutinib
Severity: Major
Selpercatinib and Tolebrutinib: 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
Selpercatinib inhibits CYP2C8 and may increase tolebrutinib exposure while decreasing M2 formation. Higher exposure raises the potential for tolebrutinib toxicity, including hepatic effects.
What this interaction means in plain words
Selpercatinib and Tolebrutinib 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.
Selpercatinib belongs to Oncology; Tolebrutinib belongs to Central Nervous System.
Why it happens
Inhibition of CYP2C8 decreases tolebrutinib metabolism.
What to do
Avoid the combination if possible. If both are required, monitor liver function closely and reassess tolebrutinib need.
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 Tolebrutinib
Other interactions of Selpercatinib
Frequently asked questions
Can I take Selpercatinib with Tolebrutinib?
MediHelp rates the interaction as major. Selpercatinib and Tolebrutinib 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. Selpercatinib inhibits CYP2C8 and may increase tolebrutinib exposure while decreasing M2 formation. Higher exposure raises the potential for tolebrutinib toxicity, including hepatic effects.
How serious is the interaction between Selpercatinib and Tolebrutinib?
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 if possible. If both are required, monitor liver function closely and reassess tolebrutinib need.
What other medicines interact with Tolebrutinib?
MediHelp also lists interactions of Tolebrutinib with, for example, Carbamazepine, Deferasirox, Efavirenz. The full list is on the Tolebrutinib page.
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