Moderately Severe to Severe NPDR Clinical Trial
Official title:
A Randomized, Double-masked, Multicenter, Placebo Controlled Study of Keluo Xin Capsule on Efficacy and Safety in Patients With Diabetic Retinopathy
This is a study aiming to assess the efficacy and safety of Keluo Xin capsule in patients with moderately severe to severe nonproliferative diabetic retinopathy (NPDR). Two-thirds of participates will receive Keluo Xin capsules while other one third will receive placebo.
This study composes two parts. The first is a 24-week period during which subjects receive designed treatment regimen; after that, subjects will be informed again for the next 24-week regimen (extention phase) and can choose whether or not to participate in the treatment (with the same regimen in the first period) voluntarily. ;