| 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 |