The usual dosage for adult patients is 100 mg of sarpogrelate hydrochloride, administered after meal three times a day. The dosage may be adjusted according to the patient’s age and symptoms.

Stably expressing cell lines were constructed in HEK293 cells by transfecting with Lipofectamine 2000 reagent and selecting with 0.5 mg/ml G418-containing growth medium. Cells were split into 24-well plates at a density of 105 cells /well and labeled with 3 μCi/ml [3H]myo-inositol in serum-free DMEM for 24 h. Then the cells were washed with the assay medium (20 mM LiCl, 130 mM NaCl, 900 μM NaH2PO4, 5.4 mM KCl, 1.8 mM CaCl2, and 25 mM glucose in 20 mM HEPES, pH 7.4) and incubated with both SARPOGRELATE (10−9 – 10−4 M) at 37°C for 1 h. Cell extracts, in 10 mM formic acid, were applied to a 1-ml AG1-X8 resin (100 – 200 mesh; Assist Co., Tokyo) column before elution by buffer containing 1 M ammonium formate and 0.1 M formic acid. Radioactivity was measured by a liquid scintillation spectrophotometer.