Multicentre, Randomized, Controlled Trial of Qideng Mingmu Capsule in The Treatment of Diabetic Retinopathy

Objectives of study: To preliminarily evaluate the efficacy and safety of Qideng Mingmu Capsule in the treatment of patients with diabetic retinopathy (deficiency of Qi-Yin syndrome, blood stasis syndrome), to discuss the appropriate dose and period of treatment.

The efficacy of Qideng Mingmu capsule is to nourish qi-yin and promote blood circulation. It is used in patients with diabetic retinopathy who are differentiated as deficiency of Qi-Yin syndrome and blood stasis syndrome in traditional Chinese medicine(TCM).The manifestation of diabetic retinopathy(DR) mainly includes dim and dry eyes,shortness of breathe, fundus hemorrhage,etc.The experimental research indicated that the Qideng Mingmu capsule could improve the GK rats' quality of life,through reducing vascular endothelial growth factor(VEGF) level in vitreous of GK rats and inhibiting the expression of protein kinase C(PKC),therefore is capillary protective agent against retinal impairment in GK rat.The toxicology test has proved that the clinical dosage of Qideng Mingmu capsule is safe.Both acute and long-term toxicity tests has showed no toxicity.

Eligibility Criteria:
Inclusion Criteria:

* Diagnosed with non-proliferative diabetic retinopathy(NPDR)，differentiated as deficiency of Qi-Yin syndrome or blood stasis syndrome in traditional Chinese medicine(TCM).
* best-corrected ETDRS visual acuity in study eye≥15 letters,or about 0.16(20/125) by the decimal point method.
* Age between 30 and 70 years old.
* Able and willing to give informed consent
* Keep the level of blood sugar steady during the last three months before randomization, meanwhile the glucose lowering therapy could be predicted without any change during this study.
* Eligible patients are with moderate and severe diabetic retinopathy primarily, mild of whom are controlled within 15%.
* All procedures from participance in the study voluntarily, signature on the Informed Consent Form (ICF) and acceptance of treatment are according to GCP guidelines.

Exclusion Criteria:

* Patients with ineffective blood sugar control (HbAlc\>9%) or without usage of fundamental antidiabetic drugs such as biguanides, sulfonylureas (SUs), insulin and thiazolidinediones (TZDs).
* Patients who have had intraocular surgery like retina photocoagulation within 6 month; or are appropriate for laser photocoagulation currently, on the condition that more than two quadrants have extensive non-perfusion areas.
* Patients with other ophthalmological combined diseases like glaucoma, cataract that have effected the check of eyeground deeply, non-diabetic retinopathy, uveitis, retinal detachment, diseases of optic nerve, high myopia with eyeground pathological changes,etc.
* Patients with severe cardiovascular diseases, functional disorders of liver and kidneys, diseases of the haematopoietic system (bone marrow hypoplasia, leucopenia, anemia, etc.), severely abnormal electrocardiogram (ECG), ALT\>2 \*ULN, Cr \>1.5\*ULN and psychopaths.-Patients with diabetic nephropathy (DN) in the stage of azotemia or uremia.
* Pregnant women or trying to conceive or in lactation; patients with allergic constitution.
* Patients who have participated in other clinical trials in recent one month.
* Patients who have used the drugs in the treatment of diabetic retinopathy (calcium dobesilate, Difrarel, capsule of Xueshuantong, ginkgo biloba extract, Qiming granula, etc.) in past two weeks.
* Patients with SBP\>160mmHg or DBP﹥100mmHg.