Drug interactions
Lofexidine + Vemurafenib
Severity: Moderate
Lofexidine and Vemurafenib: moderate 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
Vemurafenib can cause concentration-dependent QT prolongation, and lofexidine also lengthens the QT interval. Used together, they may increase the risk of torsades de pointes.
What this interaction means in plain words
Lofexidine and Vemurafenib can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Lofexidine belongs to Central Nervous System; Vemurafenib belongs to Oncology.
Why it happens
Additive prolongation of the QTc interval.
What to do
Obtain a baseline ECG and monitor ECG and electrolytes regularly during combined therapy. Interrupt or reduce vemurafenib, or stop lofexidine, if the QTc becomes markedly prolonged.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Lofexidine
- Adagrasib + Lofexidine Major
- Alfuzosin + Lofexidine Major
- Amiodarone + Lofexidine Major
- Amisulpride + Lofexidine Major
- Anagrelide + Lofexidine Major
- Apomorphine + Lofexidine Major
Other interactions of Vemurafenib
Frequently asked questions
Can I take Lofexidine with Vemurafenib?
MediHelp rates the interaction as moderate. Lofexidine and Vemurafenib can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Vemurafenib can cause concentration-dependent QT prolongation, and lofexidine also lengthens the QT interval. Used together, they may increase the risk of torsades de pointes.
How serious is the interaction between Lofexidine and Vemurafenib?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Obtain a baseline ECG and monitor ECG and electrolytes regularly during combined therapy. Interrupt or reduce vemurafenib, or stop lofexidine, if the QTc becomes markedly prolonged.
What other medicines interact with Lofexidine?
MediHelp also lists interactions of Lofexidine with, for example, Adagrasib, Alfuzosin, Amiodarone. The full list is on the Lofexidine page.
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