MAJOR — Use With Caution
FDA-documented interaction. Rifampin can reduce tacrolimus levels by 50-80%. Massive dose increases may be needed. Organ rejection risk is high.
Evidence level: STRONG
Rifampin can reduce tacrolimus levels so dramatically that your transplanted organ could be rejected. This is one of the most dangerous drug interactions for transplant patients.
Rifampin powerfully induces CYP3A4 and P-gp, dramatically reducing tacrolimus levels. Can cause organ rejection in transplant patients. FDA tacrolimus label warns about rifampin.
If you are a transplant patient who needs rifampin, your transplant team must be involved. Very frequent tacrolimus level monitoring is essential. Alternative TB treatments should be considered.
Follow each medication's specific timing instructions. Rifampin — check if it requires an empty stomach or should be taken with food. Tacrolimus follows its normal schedule. Complete the full antibiotic course as prescribed.
Solid organ transplant, recent transplant, borderline graft function
Signs of organ rejection vary by organ — fever, pain at transplant site, decreased organ function (less urine for kidney, jaundice for liver), general malaise
Discuss alternative TB regimens that avoid rifampin (rifabutin may be somewhat better). Plan very frequent tacrolimus monitoring (multiple times per week initially). Expect to need major dose increases.
Antibiotic interactions are often temporary (duration of treatment). Space supplements and probiotics 2-3 hours away from antibiotic doses. Ask your pharmacist if timing adjustments can reduce the interaction risk.
Rifampin can reduce tacrolimus levels so dramatically that your transplanted organ could be rejected. This is one of the most dangerous drug interactions for transplant patients.
Follow each medication's specific timing instructions. Rifampin — check if it requires an empty stomach or should be taken with food. Tacrolimus follows its normal schedule. Complete the full antibiotic course as prescribed.
Signs of organ rejection vary by organ — fever, pain at transplant site, decreased organ function (less urine for kidney, jaundice for liver), general malaise
Antibiotic interactions are often temporary (duration of treatment). Space supplements and probiotics 2-3 hours away from antibiotic doses. Ask your pharmacist if timing adjustments can reduce the interaction risk.
Discuss alternative TB regimens that avoid rifampin (rifabutin may be somewhat better). Plan very frequent tacrolimus monitoring (multiple times per week initially). Expect to need major dose increases.
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