Drug interactions
Ketoconazole + Telavancin
Severity: Major
Ketoconazole and Telavancin: 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
Ketoconazole is known to prolong the QTc interval and has been associated with torsades de pointes. Added to telavancin, it may increase the risk of serious ventricular arrhythmia.
What this interaction means in plain words
Ketoconazole and Telavancin 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.
Ketoconazole belongs to Anti Fungals; Telavancin belongs to Anti Bacterial.
Why it happens
Additive prolongation of cardiac repolarization via potassium channel blockade.
What to do
Avoid the combination if possible by using alternative agents. If both are essential, monitor ECG and electrolytes closely and correct any abnormalities.
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 Telavancin
- Telavancin + Thioridazine Contraindicated
- Adagrasib + Telavancin Major
- Amiodarone + Telavancin Major
- Amisulpride + Telavancin Major
- Anagrelide + Telavancin Major
- Arsenic trioxide + Telavancin Major
Other interactions of Ketoconazole
- Alfuzosin + Ketoconazole Contraindicated
- Alprazolam + Ketoconazole Contraindicated
- Avanafil + Ketoconazole Contraindicated
- Conivaptan + Ketoconazole Contraindicated
- Dihydroergotamine intranasal + Ketoconazole Contraindicated
- Dihydroergotamine + Ketoconazole Contraindicated
Frequently asked questions
Can I take Ketoconazole with Telavancin?
MediHelp rates the interaction as major. Ketoconazole and Telavancin 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. Ketoconazole is known to prolong the QTc interval and has been associated with torsades de pointes. Added to telavancin, it may increase the risk of serious ventricular arrhythmia.
How serious is the interaction between Ketoconazole and Telavancin?
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 by using alternative agents. If both are essential, monitor ECG and electrolytes closely and correct any abnormalities.
What other medicines interact with Telavancin?
MediHelp also lists interactions of Telavancin with, for example, Thioridazine, Adagrasib, Amiodarone. The full list is on the Telavancin page.
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