Drug Interactions between cisapride and lopinavir / ritonavir

Using cisapride together with ritonavir is not recommended. Combining these medications may significantly increase the blood levels and effects of cisapride. High blood levels of cisapride can occasionally cause an irregular heart rhythm that may be serious. You should seek immediate medical attention if you develop sudden dizziness, lightheadedness, fainting, or fast or pounding heartbeats during treatment with cisapride. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

**Cisapride (Propulsid) is no longer marketed in the United States. You should only be taking cisapride if you are obtaining the medication from your doctor though a Limited Access Program developed jointly by the manufacturer and the FDA.**

Cisapride is no longer commercially available in the U.S. You should only take cisapride if you are prescribed the medication through an investigational limited access program and are closely monitored by your doctor.

Using cisapride together with lopinavir is not recommended. Combining these medications can increase the risk of an irregular heart rhythm that may be serious and potentially life-threatening, although it is a relatively rare side effect. You may be more susceptible if you have a heart condition called congenital long QT syndrome, other cardiac diseases, conduction abnormalities, or electrolyte disturbances (for example, magnesium or potassium loss due to severe or prolonged diarrhea or vomiting). Talk to your doctor if you have any questions or concerns. Your doctor may be able to prescribe alternatives that do not interact. You should seek immediate medical attention if you develop sudden dizziness, lightheadedness, fainting, shortness of breath, or heart palpitations during treatment with either of these medications. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.