Chengdu Medson Pharmaceutical Biotechnology Co., Ltd.

To study the pharmacokinetic characteristics of Rasagiline Mesylate Tablets developed by Sichuan Xiangxiang Pharmaceutical Co., Ltd. in healthy humans after single, multiple, and single administrations on an empty stomach, and to explore the characteristics of drug absorption, distribution, metabolism, and elimination in the human body, to provide research data for the registration application of Rasagiline Mesylate Tablets, to provide a reference basis for the dosing regimen of the Phase II clinical trial of Rasagiline Mesylate Tablets, and to provide an experimental basis for determining the clinical dosing regimen of Rasagiline Mesylate Tablets.

To investigate the efficacy and safety of rasagiline mesylate tablets compared with placebo as add-on therapy in patients with idiopathic Parkinson's disease.

To evaluate the efficacy and safety of meptazinol hydrochloride tablets in the treatment of moderate pain after limb fracture surgery, using tramadol hydrochloride as a control.