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Mycophenolic acid (INN) (IPA: ) or mycophenolate is an immunosuppresant drug used to prevent rejection in organ transplantation. It was initially marketed as the prodrug mycophenolate mofetil (abbreviated MMF) to improve oral bioavailability. More recently, the salt mycophenolate sodium has also been introduced. Mycophenolic acid is commonly marketed under the trade names Cellcept (mycophenolate mofetil; Roche) and Myfortic (mycophenolate sodium; Novartis).
Pharmacokinetics/pharmacology
Mycophenolate is derived from the fungus Penicillium stoloniferum. Mycophenolate mofetil is metabolised in the liver to the active moiety mycophenolic acid. It inhibits inosine mononophosphate dehydrogenase, the enzyme which controls the rate of synthesis of guanine monophosphate in the de novo pathway of purine synthesis used in the proliferation of lymphocytes.
Mycophenolate is therefore a potent anti-proliferative, and can be used in place of the older anti-proliferative azathioprine. It is usually used as part of triple therapy including a calcineurin inhibitor (ciclosporin or tacrolimus) and prednisolone.
Clinical use
Indications
Generally speaking, mycophenolate is used for the prevention of organ transplant rejection. Specifically, mycophenolate mofetil is indicated for the prevention of organ transplant rejection in adults and renal transplant rejection in children >2 years; while mycophenolate sodium is indicated for the prevention of renal transplant rejection in adults. Mycophenolate sodium has also been used for the prevention of rejection in liver, heart and/or lung transplants in children >2 years.Rossi S, editor. Australian Medicines Handbook 2006. Adelaide: Australian Medicines Handbook; 2006. ISBN 0-9757919-2-3Adverse effects
Common adverse drug reactions (≥1% of patients) associated with mycophenolate therapy include: diarrhoea, nausea, vomiting, infections, leucopenia, and/or anaemia. Mycophenolate sodium is also commonly associated with fatigue, headache and/or cough. Intravenous (IV) administration of mycophenolate mofetil is also commonly associated with thrombophlebitis and thrombosis. Infrequent adverse effects (0.1–1% of patients) include: oesophagitis, gastritis, gastrointestinal tract haemorrhage, and/or invasive cytomegalovirus (CMV) infection.Rossi S, editor. Australian Medicines Handbook 2006. Adelaide: Australian Medicines Handbook; 2006. ISBN 0-9757919-2-3Comparison to other agents
Compared with azathioprine it is more lymphocyte-specific and is associated with less bone marrow suppression, fewer opportunistic infections and lower incidence of acute rejection.Woodroffe R, Yao G, Meads C, Bayliss S, Ready A, Raftery J, et al. Clinical and cost-effectiveness of newer immunosuppressive regimens in renal transplantation: a systematic review and modelling study. Health Technol Assess 2005;9(21):1-194. PMID 15899149 The exact role of mycophenolate vs azathioprine has yet to be conclusively established, but many centres use it in place of azathioprine for high-risk patients, or patients who have already experienced an episode of acute rejection. In long-term immunosuppression, it may be used to avoid calcineurin inhibitors or steroids.Potential future uses
The role of mycophenolic acid in the management of idiopathic thrombocytopenic purpura (ITP) and systemic lupus erythematosus (SLE) is being studied.Footnotes
External links
- MedlinePlus drug information: mycophenolate (systemic) – information from USP DI Advice for the Patient
"Mycophenolic acid"