A Multicenter，Double-Blind and Randomized Controlled Trial of Fengshigutong Capsule in the Treatment of Ankylosing Spondylitis

This is a randomized, double-blind, multicentral clinical trial to investigate the efficacy and safety of Fengshigutong Capsule in the treatment of active ankylosing spondylitis(AS). The primary purpose is to assess the different maintaining treatment programme in AS patients with controlled inflammation by Imrecoxib. The trial will include 180 patients who will be divided into three group: Fengshigutong Capsule plus Imrecoxib group, Imrecoxib group and Fengshigutong Capsule group. Patients will complete the 4-week therapy.