Dược Động Học :
▧ Absorption :
Once ingested, dimethyl fumarate is rapidly hydroylyzed by esterases to MMF. Thus there is negligible amount of dimethyl fumarate in the body, and all pharmacokinetic information is quantified with MMF. In multiple sclerosis patients, the time to maximum concentration of MMF is 2 to 2.5 hours and the maximum concentration is 1.87 mg/L.
▧ Volume of Distribution :
In healthy people, MMF has a variable volume of distribution of 53 to 73 litres.
▧ Protein binding :
MMF has a plasma protein binding range of 27 to 45%, and the binding is concentration independent.
▧ Metabolism :
Dimethly fumarate is hydrozlied to its metabolite MMF in the GIT, tissues, and blood by esterases. MMF then undergoes subsequent metabolism in the tricarboxylic acid (TCA) cycle. Altogether the main metabolites formed are MMF, glucose, citric acid, and fumaric.
▧ Route of Elimination :
The main route of elimination is by CO2 exhalation that accounts for 60% of the dose. The other minor routes are through the kidney (16% metabolites and trace amounts of unchanged MMF) and the feces (1%).
▧ Half Life :
MMF has a short half life of about 1 hour, and MMF does not accumulate after repeated doses of dimethyl fumarate.
▧ Clearance :
MMF clearance was not quantified.