Drug interactions
Lofexidine + Selpercatinib
Severity: Moderate
Lofexidine and Selpercatinib: 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
Both drugs can prolong the QT interval, so giving them together may raise the risk of serious ventricular arrhythmias such as torsades de pointes. The risk is higher with electrolyte disturbances, bradycardia or existing heart disease.
What this interaction means in plain words
Lofexidine and Selpercatinib 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; Selpercatinib belongs to Oncology.
Why it happens
Additive prolongation of cardiac repolarization (QTc) through pharmacodynamic effects.
What to do
Obtain a baseline ECG and monitor the QTc during combined use, and correct potassium and magnesium abnormalities. Reduce the dose or stop one agent 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 Selpercatinib
Frequently asked questions
Can I take Lofexidine with Selpercatinib?
MediHelp rates the interaction as moderate. Lofexidine and Selpercatinib 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. Both drugs can prolong the QT interval, so giving them together may raise the risk of serious ventricular arrhythmias such as torsades de pointes. The risk is higher with electrolyte disturbances, bradycardia or existing heart disease.
How serious is the interaction between Lofexidine and Selpercatinib?
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 the QTc during combined use, and correct potassium and magnesium abnormalities. Reduce the dose or stop one agent 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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