Abstract
The bioavailability of clopidogrel bisulfate (CAS 135046-48-9) form I was compared
with that of Clopidogrel bisulfate form II in 12 male Sprague-Dawley rats. The rats,
randomly divided into two groups, received a single oral dose of 8 mg/kg Clopidogrel
(CP) bisulfate form I and form II, respectively, under fasting condition. The plasma
concentrations of CP and its inactive carboxylic acid metabolite (CAS 144457-28-3,
IM) were simultaneously determined by a sensitive, specific LC-MS/MS method. The pharmacokinetic
parameters included Cmax, Tmax, t1/2, AUC0–t AUC0–∞. The AUC0–∞ of CP was 13.78 ± 0.67 and 11.46 ± 1.98 ng/mL · h for CP form I and form II, respectively.
The AUC0–∞ of IM was 33.08 ± 5.76 and 21.67 ± 8.95 μg/mL · h for CP form I and form II, respectively.
The maximum plasma concentration (Cmax) of CP was 3.81 ± 0.54 ng/mL for CP form I and 3.18 ± 0.31 ng/mL for CP form II,
the Cmax of IM was 3.42 ± 0.41 and 2.08 ± 0.68 μg/mL for the CP form I and form II, respectively.
There was an obvious difference between form I and form II for Cmax and the area under the plasma concentration time curve for both CP and IM after a
t-test. This study shows that CP form I has better bioavailability in rats than CP
form II.
Key words
Antiplatelet drug - Bioavailability - Clopidogrel bisulfate - Clopidogrel carboxylic
acid metabolite - LC-MS/MS - Solid form