Kees, M. G. and Steinke, T. and Moritz, S. and Rupprecht, K. and Paulus, E. M. and Kees, F. and Bucher, M. and Faerber, L. (2012) Omeprazole Impairs the Absorption of Mycophenolate Mofetil But Not of Enteric-Coated Mycophenolate Sodium in Healthy Volunteers. JOURNAL OF CLINICAL PHARMACOLOGY, 52 (8). pp. 1265-1272. ISSN 0091-2700,
Full text not available from this repository. (Request a copy)Abstract
In 2 crossover studies, 12 healthy volunteers (6 male/6 female) received a single oral dose of mycophenolate mofetil (MMF) 1000 mg or an equimolar dose of enteric-coated mycophenolate sodium (EC-MPS) 720 mg fasting with and without coadministered omeprazole 20 mg bid. The plasma concentrations of mycophenolic acid (MPA) and of the inactive metabolite mycophenolic acid glucuronide (MPA-G) were measured by high-performance liquid chromatography (HPLC). In addition, dissolution of MMF 500 mg or EC-MPS 360 mg tablets was determined using an USP paddle apparatus in aqueous buffer of pH 1 to 7. The bioavailability of MPA following administration of MMF or EC-MPS was similar except for the time to peak concentration, which was longer in the EC-MPS group. Concomitant treatment with omeprazole lowered significantly C-max and AUC(12h) of MPA following administration of MMF. The pharmacokinetics of EC-MPS was not affected. Dissolution of MMF in aqueous buffer decreased dramatically at pH above 4.5. The EC-MPS tablet was stable up to pH 5. Above, EC-MPS was quantitatively disintegrated and MPS quantitatively dissolved. There is strong evidence that impaired absorption of MMF with concomitant proton pump inhibitors is due to incomplete dissolution of MMF in the stomach at elevated pH.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PROTON PUMP INHIBITORS; HEART-TRANSPLANT RECIPIENTS; DRUG EXPOSURE; KIDNEY-TRANSPLANTATION; RENAL-TRANSPLANTATION; ACID; PHARMACOKINETICS; BIOAVAILABILITY; GLUCURONIDE; THERAPY; proton-pump inhibitor; drug-drug interaction; pharmacokinetics; bioavailability; HPLC |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Anästhesiologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 May 2020 06:49 |
| Last Modified: | 07 May 2020 06:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/18369 |
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