Increase cisapride to dangerous blood levels*

Clarithromycin (Biaxin)

Erythromycin

Troleandomycin (Tao)

Nefazodone (Serzone)

Fluconazole (Diflucan)

Itraconazole (Sporanox)

Ketoconazole (Nizoral)

Indinavir (Crixivan)

Ritonavir (Norvir)

Predispose patients to fatal arrhythmias with cisapride†

Class 1A antiarrhythmics

Class III antiarrhythmics

Certain tricyclic antidepressants

Certain tetracyclic antidepressants

Certain antipsychotics