Interazioni tra farmaci
Astemizole + Clarithromycin
Gravità: Controindicata
Astemizole and Clarithromycin: contraindicated interaction.
Ultimo aggiornamento Fonti: US FDA label
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Sintesi
Clarithromycin raises astemizole concentrations and, together with the intrinsic QT effect of both drugs, may cause torsades de pointes and sudden death. The combination is contraindicated. Astemizole has been withdrawn in many markets, so the interaction is mainly of historical relevance.
Cosa significa questa interazione in parole semplici
Astemizole and Clarithromycin are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Perché avviene
Clarithromycin inhibits CYP3A4-mediated metabolism of astemizole and also prolongs QT through IKr blockade, giving pharmacokinetic and pharmacodynamic synergy.
Cosa fare
Do not combine. Use a non-sedating antihistamine without QT liability, such as fexofenadine, loratadine or cetirizine.
Cosa chiedere al farmacista
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Riferimenti
Altre interazioni di Clarithromycin
- Avanafil + Clarithromycin Controindicata
- Cisapride + Clarithromycin Controindicata
- Clarithromycin + Colchicine Controindicata
- Clarithromycin + Conivaptan Controindicata
- Clarithromycin + Dihydroergotamine Controindicata
- Clarithromycin + Dihydroergotamine intranasal Controindicata
Domande frequenti
Can I take Astemizole with Clarithromycin?
MediHelp rates the interaction as contraindicated. Astemizole and Clarithromycin are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Clarithromycin raises astemizole concentrations and, together with the intrinsic QT effect of both drugs, may cause torsades de pointes and sudden death. The combination is contraindicated. Astemizole has been withdrawn in many markets, so the interaction is mainly of historical relevance.
How serious is the interaction between Astemizole and Clarithromycin?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not combine. Use a non-sedating antihistamine without QT liability, such as fexofenadine, loratadine or cetirizine.
What other medicines interact with Clarithromycin?
MediHelp also lists interactions of Clarithromycin with, for example, Avanafil, Cisapride, Colchicine. The full list is on the Clarithromycin page.
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