藥物交互作用
Clozapine + Darifenacin
嚴重程度: 嚴重
Clozapine and Darifenacin: major interaction.
最後更新
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摘要
Both drugs have anticholinergic activity, and clozapine already causes constipation that can progress to severe gastrointestinal hypomotility or ileus. Adding darifenacin raises the risk of constipation, urinary retention, tachycardia and cognitive effects. Darifenacin may also modestly increase clozapine exposure by CYP2D6 inhibition.
用白話說明這項交互作用的意義
Clozapine and Darifenacin 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.
Clozapine belongs to Central Nervous System; Darifenacin belongs to Genitourinary.
為什麼會發生
Additive antimuscarinic effects, with possible CYP2D6 inhibition by darifenacin raising clozapine levels.
處置方式
Avoid the combination where possible, or monitor bowel function closely and treat constipation early. Review the need for darifenacin and reduce the clozapine dose if toxicity occurs.
可向藥師詢問的問題
- 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?
Darifenacin 的其他交互作用
Clozapine 的其他交互作用
常見問題
Can I take Clozapine with Darifenacin?
MediHelp rates the interaction as major. Clozapine and Darifenacin 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 drugs have anticholinergic activity, and clozapine already causes constipation that can progress to severe gastrointestinal hypomotility or ileus. Adding darifenacin raises the risk of constipation, urinary retention, tachycardia and cognitive effects. Darifenacin may also modestly increase clozapine exposure by CYP2D6 inhibition.
How serious is the interaction between Clozapine and Darifenacin?
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 where possible, or monitor bowel function closely and treat constipation early. Review the need for darifenacin and reduce the clozapine dose if toxicity occurs.
What other medicines interact with Darifenacin?
MediHelp also lists interactions of Darifenacin with, for example, Atazanavir, Bethanechol, Clarithromycin. The full list is on the Darifenacin page.
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