A parmaceutical composition comprising: a 1:1 solvate of 5-(5,5-dimethyl-1,3,2-dioxaphosphorinane-2-yl)-1,4-dihydro-2,6-dimethy l-4-(3-nit rophenyl)-3-pyridine carboxylic acid 2-(phenyl(phenylmethyl)amino) ethyl ester P-oxide hydrochloride-ethanol (NZ-105) and hydroxypropylmethylcellulose acetate succinate is disclosed. The composition can easily be prepared into tablets, capsules, granules, and powders, which exhibit an enhanced bioavailability, e.g. provides a high blood concentration of the active component NZ-105 and ensures a high total drug absorption.
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