藥物交互作用
Cimetidine + Dofetilide
嚴重程度: 禁忌併用
Cimetidine and Dofetilide: contraindicated interaction.
最後更新 來源: US FDA label
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本頁的臨床內容僅提供英文版。
摘要
Cimetidine increases dofetilide plasma concentrations, with greater effect at higher cimetidine doses, and raises the risk of QT prolongation and torsades de pointes. Dofetilide labeling contraindicates concomitant cimetidine. Patients with renal impairment are especially vulnerable.
用白話說明這項交互作用的意義
Cimetidine and Dofetilide 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.
Cimetidine belongs to Gastrointestinal Tract; Dofetilide belongs to Cardiovascular.
為什麼會發生
Cimetidine inhibits renal tubular cationic secretion (OCT2/MATE) and possibly CYP3A4, reducing dofetilide renal clearance and increasing exposure.
處置方式
Do not co-administer. Use an alternative acid suppressant such as a proton pump inhibitor, or famotidine, which is not known to share this effect.
可向藥師詢問的問題
- 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?
參考資料
Dofetilide 的其他交互作用
Cimetidine 的其他交互作用
常見問題
Can I take Cimetidine with Dofetilide?
MediHelp rates the interaction as contraindicated. Cimetidine and Dofetilide 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. Cimetidine increases dofetilide plasma concentrations, with greater effect at higher cimetidine doses, and raises the risk of QT prolongation and torsades de pointes. Dofetilide labeling contraindicates concomitant cimetidine. Patients with renal impairment are especially vulnerable.
How serious is the interaction between Cimetidine and Dofetilide?
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 co-administer. Use an alternative acid suppressant such as a proton pump inhibitor, or famotidine, which is not known to share this effect.
What other medicines interact with Dofetilide?
MediHelp also lists interactions of Dofetilide with, for example, Amiodarone, Amisulpride, Amlodipine-hydrochlorothiazide-valsartan. The full list is on the Dofetilide page.
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