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Interazioni tra farmaci

Clarithromycin + Rifabutin

Gravità: Maggiore

Clarithromycin and Rifabutin: major interaction.

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Sintesi

Clarithromycin is a strong CYP3A4 inhibitor, and rifabutin is cleared largely by CYP3A4; clarithromycin also blocks its metabolism. Raised rifabutin exposure can lead to rifabutin toxicity including uveitis, neutropenia and arthralgia, while rifabutin lowers clarithromycin levels.

Cosa significa questa interazione in parole semplici

Clarithromycin and Rifabutin 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.

Clarithromycin belongs to Anti Bacterial; Rifabutin belongs to Anti Bacterial.

Livello di evidenza: High

Perché avviene

CYP3A4 inhibition by clarithromycin reduces first-pass and systemic clearance of rifabutin

Cosa fare

Avoid if an alternative exists; otherwise reduce the rifabutin dose per labelling, monitor closely for toxicity and recheck after the inhibitor is stopped.

Cosa chiedere al farmacista

  • 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?

Bring a full list of your medicines, including over-the-counter products, supplements and herbal remedies, to every pharmacy visit.

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Domande frequenti

Can I take Clarithromycin with Rifabutin?

MediHelp rates the interaction as major. Clarithromycin and Rifabutin 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. Clarithromycin is a strong CYP3A4 inhibitor, and rifabutin is cleared largely by CYP3A4; clarithromycin also blocks its metabolism. Raised rifabutin exposure can lead to rifabutin toxicity including uveitis, neutropenia and arthralgia, while rifabutin lowers clarithromycin levels.

How serious is the interaction between Clarithromycin and Rifabutin?

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 an alternative exists; otherwise reduce the rifabutin dose per labelling, monitor closely for toxicity and recheck after the inhibitor is stopped.

What other medicines interact with Clarithromycin?

MediHelp also lists interactions of Clarithromycin with, for example, Astemizole, Avanafil, Cisapride. The full list is on the Clarithromycin page.

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