Botulinum Toxin Type A for Injection (HengLi®) in the Treatment of Trigeminal Neuralgia

This study plans to enroll 240 subjects, and the efficacy measures \[VAS score, DSIS score, daily pain duration (if applicable), and number of daily pain episodes\] will be collected from subjects using the electronic Patient-Reported Outcomes (ePRO) throughout the study. The study period mainly consists of a screening period (14 days before the first dose), a double-blind treatment period (from the first dose to Week 12), and an extension period (from Week 13 to Week 52), including a maximum of 4 treatment cycles (each cycle lasts 12 week)