Dược Động Học :
▧ Absorption :
Bioavailability, healthy subjects = 6%;
T max, healthy subjects = 10 minutes;
Time to steady state, healthy subjects = 2 days;
▧ Volume of Distribution :
Following IV administration, the volume of distribution is 300 L
▧ Metabolism :
The major route of metabolism of aclidinium bromide is hydrolysis, which occurs both chemically and enzymatically by esterases in the plasma. Aclidinium bromide is rapidly and extensively hydrolyzed to its alcohol and dithienylglycolic acid derivatives, neither of which binds to muscarinic receptors and are pharmacologically inactive.
▧ Route of Elimination :
Intravenously administered radiolabelled aclidinium bromide was administered to healthy volunteers and was extensively metabolized with 1% excreted as unchanged aclidinium. Approximately 54% to 65% of the radioactivity was excreted in urine and 20% to 33% of the dose was excreted in feces. The combined results indicated that almost the entire aclidinium bromide dose was eliminated by hydrolysis. After dry powder inhalation, urinary excretion of aclidinium is about 0.09% of the dose.
▧ Half Life :
Plasma half-life = 2.4 minutes (indicating that aclidinium is very rapidly hydrolyzed in plasma into its two inactive metabolites and has a low chance of causing systemic side effects).
Effective half-life = 5-8 hours.
▧ Clearance :
Total clearance, IV dose, young healthy subjects = 170 L/h (inter-individual variability of 36%)