The purpose of this study is evaluate the efficay and safety of benzonatate soft capsules for improving adult cough symtoms. The study was designed to be randomized, double-blind, placebo-controlled.Subjects were randomly assigned to the benzonatate soft capsule group and the placebo group on a 1:1 basis。According to the regulatory requirements, 200 cases were planned to be included. Considering that poor efficacy of the placebo control group might lead to shedding, a 10% increase in shedding was achieved, and 220 cases were finally determined, with 110 cases in each group.
The purpose of this study is evaluate the efficay and safety of benzonatate soft capsules for improving adult cough symtoms.