Comparative Pharmacology
Head-to-head clinical analysis: IMURAN versus MYCOPHENOLATE MOFETIL.
Peer-Reviewed Evidence
Head-to-head clinical analysis: IMURAN versus MYCOPHENOLATE MOFETIL.
IMURAN vs MYCOPHENOLATE MOFETIL
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Imuran (azathioprine) is a purine antimetabolite that inhibits DNA synthesis by interfering with purine metabolism. It is converted in vivo to 6-mercaptopurine (6-MP), which is further metabolized to thioinosinic acid and thioguanine nucleotides. These metabolites inhibit de novo purine synthesis and incorporation of purines into nucleic acids, thereby suppressing T-cell proliferation and antibody production.
Mycophenolate mofetil is a prodrug that is rapidly hydrolyzed to mycophenolic acid (MPA), a potent, selective, uncompetitive, and reversible inhibitor of inosine monophosphate dehydrogenase (IMPDH), which inhibits the de novo pathway of guanosine nucleotide synthesis. This inhibition preferentially blocks proliferation of T- and B-lymphocytes, as they are critically dependent on this pathway, thereby suppressing cell-mediated immune responses and antibody formation.
Initially 3-5 mg/kg/day orally once daily; maintenance dose 1-3 mg/kg/day orally once daily. IV dose equivalent to oral.
1 g orally twice daily; intravenous infusion 1 g over 2 hours twice daily for up to 14 days.
None Documented
None Documented
Clinical Note
moderateMycophenolate mofetil + Digitoxin
"Mycophenolate mofetil may decrease the cardiotoxic activities of Digitoxin."
Clinical Note
moderateMycophenolate mofetil + Deslanoside
"Mycophenolate mofetil may decrease the cardiotoxic activities of Deslanoside."
Clinical Note
moderateMycophenolate mofetil + Acetyldigitoxin
"Mycophenolate mofetil may decrease the cardiotoxic activities of Acetyldigitoxin."
Clinical Note
moderateMycophenolate mofetil + Ouabain
Azathioprine: 0.16–0.75 h; 6-mercaptopurine: 1.5–4.7 h (terminal). Extended up to 5 h in renal impairment. Context: short half-life allows daily dosing; clinical effect persists due to active metabolites.
The terminal elimination half-life of mycophenolic acid (MPA) is approximately 8-16 hours in healthy volunteers and renal transplant patients. In patients with renal impairment, the half-life may be prolonged due to accumulation of MPAG. The half-life supports twice-daily dosing.
Primarily renal excretion of inactive metabolites; 50% as 6-thiouric acid and other metabolites; <2% unchanged. Minor biliary/fecal elimination (<10% total).
Mycophenolate mofetil is extensively metabolized to mycophenolic acid (MPA), which is primarily eliminated in urine as MPA glucuronide (MPAG). Approximately 87% of the dose is excreted in urine as MPAG, with less than 1% as unchanged MPA. Fecal excretion accounts for about 6% of the dose, mainly as MPAG. Biliary excretion contributes to enterohepatic recirculation of MPA, enhancing its exposure.
Category C
Category D/X
Immunosuppressant
Immunosuppressant
"Mycophenolate mofetil may decrease the cardiotoxic activities of Ouabain."