Drug interactions
Lofepramine + Ranolazine
Severity: Major
Lofepramine and Ranolazine: major interaction.
Last updated Sources: US FDA label
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 agents can prolong QTc, and ranolazine inhibits CYP2D6, which may raise tricyclic antidepressant levels. Together this increases the risk of arrhythmia and anticholinergic or cardiac toxicity.
What this interaction means in plain words
Lofepramine and Ranolazine 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
Additive QTc prolongation plus ranolazine inhibition of CYP2D6 metabolism of lofepramine's active metabolite.
What to do
Avoid if possible; otherwise monitor ECG and electrolytes and use the lowest effective lofepramine 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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References
Other interactions of Ranolazine
- Adagrasib + Ranolazine Contraindicated
- Amobarbital + Ranolazine Contraindicated
- Apalutamide + Ranolazine Contraindicated
- Butabarbital + Ranolazine Contraindicated
- Carbamazepine + Ranolazine Contraindicated
- Clarithromycin + Ranolazine Contraindicated
Frequently asked questions
Can I take Lofepramine with Ranolazine?
MediHelp rates the interaction as major. Lofepramine and Ranolazine 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. Both agents can prolong QTc, and ranolazine inhibits CYP2D6, which may raise tricyclic antidepressant levels. Together this increases the risk of arrhythmia and anticholinergic or cardiac toxicity.
How serious is the interaction between Lofepramine and Ranolazine?
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 if possible; otherwise monitor ECG and electrolytes and use the lowest effective lofepramine dose.
What other medicines interact with Ranolazine?
MediHelp also lists interactions of Ranolazine with, for example, Adagrasib, Amobarbital, Apalutamide. The full list is on the Ranolazine page.
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