Sirolimus and Tacrolimus interaction
Sirolimus and Tacrolimus: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Sirolimus label · effective 2026-03-26
• Liver Transplantation – Excess Mortality, Graft Loss, and Hepatic Artery Thrombosis (HAT) The use of sirolimus in combination with tacrolimus was associated with excess mortality and graft loss in a study in de novo liver transplant patients.
In this and another study in de novo liver transplant patients, the use of sirolimus in combination with cyclosporine or tacrolimus was associated with an increase in HAT; most cases of HAT occurred within 30 days post-transplantation and most led to graft loss or death [ see Warnings and Precautions (5.2) ].
• Increased Risk of Calcineurin Inhibitor-Induced Hemolytic Uremic Syndrome/ Thrombotic Thrombocytopenic Purpura/ Thrombotic Microangiopathy ( 5.13 )
In a study evaluating conversion from calcineurin inhibitors (CNI) to sirolimus in maintenance renal transplant patients 6–120 months post-transplant, increased urinary protein excretion was commonly observed from 6 through 24 months after conversion to sirolimus compared with CNI continuation [ see Clinical Studies (14.4) , Adverse Reactions (6.4) ].
Increased Risk of Calcineurin Inhibitor-Induced Hemolytic Uremic Syndrome/Thrombotic Thrombocytopenic Purpura/Thrombotic Microangiopathy The concomitant use of sirolimus with a calcineurin inhibitor may increase the risk of calcineurin inhibitor-induced hemolytic uremic syndrome/thrombotic thrombocytopenic purpura/thrombotic microangiopathy (HUS/TTP/TMA) [ see…
From the Tacrolimus (ASTAGRAF XL) label · effective 2026-01-14
…IN TRANSPLANT PATIENTS; AND INCREASED MORTALITY IN FEMALE LIVER TRANSPLANT PATIENTS • Increased risk for developing serious infections and malignancies with ASTAGRAF XL ® or other immunosuppressants that may lead to hospitalization or death. [see Warnings and Precautions ( 5.1 , 5.2 )] • Increased mortality in female liver transplant patients with ASTAGRAF XL.
• Increased risk for developing serious infections and malignancies with ASTAGRAF XL or other immunosuppressants that may lead to hospitalization or death.
Lymphoma and Other Malignancies Immunosuppressants, including ASTAGRAF XL, increase the risk of developing lymphomas and other malignancies, particularly of the skin .
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.