Choose two kinds of supplementary materials, imported Carboxymethylstach Sodium and Hyprolose, to have the contrastive experiments and make sure the use of final suppl.

Hydroxypropyl methyl cellulose phthalate aqueous dispersion was prepared by emulsion-solvent evaporation.

Hydroxypropyl methylcellulose (HPMC) was used as the main sustained release excipient of Naoluotong sustained release Capsules, and the formula was optimized by the orthogonal experimental design.