Drug Interaction Report

Phenylbutazone may reduce the blood levels of sirolimus protein-bound, which may make the medication less effective in some cases. Contact your doctor if your symptoms worsen or your condition changes. Your doctor may be able to prescribe alternatives that do not interact, or you may need a dose adjustment or more frequent monitoring to safely use both 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.

Grapefruit juice may increase the blood levels of sirolimus protein-bound. However, this has not been studied, and it is not known to what extent grapefruit juice may interact with sirolimus protein-bound. High blood levels of sirolimus protein-bound can increase side effects such as mouth sores and inflammation, nausea, diarrhea, vomiting, abdominal pain, decreased appetite, increased blood sugar, rash, hair loss, lung or breathing problems, and impaired bone marrow function resulting in low numbers of different types of blood cells. You may also be more likely to develop anemia, bleeding problems, or infections due to low blood cell counts. The manufacturer recommends avoiding grapefruit and grapefruit juice during treatment with sirolimus protein-bound. Talk to your doctor if you have any questions or concerns. 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.