This study is designed to evaluate the efficacy and safety of pregabalin extended-release tablets in the treatment of neuropathic pain associated with diabetic peripheral neuropathy. Pregabalin has been approved in more than 130 countries for neuropathic pain associated with diabetic peripheral neuropathy, postherpetic neuralgia, and neuralgia associated with spinal cord injury. Pregabalin extended-release tablets were administered once daily, as a single dose after dinner. Compared with pregabalin capsule formulation, it reduces the frequency of medication and improves patient compliance.

This is a multicenter, randomized, double-blind, placebo-controlled trial, the study was designed to evaluate the efficacy and safety of pregabalin sustained-release tablets in the treatment of neuropathic pain associated with diabetic peripheral neuropathy. The study includes a screening period (3 weeks, including baseline/run-in period), a treatment period (titration period, fixed dose period and withdrawal period), and a follow-up period. During the treatment period participants will receive pregabalin sustained-release tablets/placebo as daily treatment.

Inclusion Criteria:

• Aged ≥ 18 years and ≤ 75 years at screening;
• diagnosed with type 1 or type 2 diabetes for ≥ 1 year;
• diagnosed with distal symmetrical polyneuropathy caused by diabetes (type 1 or type 2), with duration of neuropathic pain associated with diabetic peripheral neuropathy ≥ 6 months;
• clearly understood and voluntarily participated in the study, and signed the informed consent form by themselves.

Exclusion Criteria:

• Subjects with other conditions that may confound the assessment of Neuropathic Pain associated with Diabetic Peripheral neuropathy (DPNP), such as: neuropathic pain other than DPNP (cervical spondylosis, carpal tunnel syndrome, spinal stenosis, postherpetic pain, etc.), pain caused by other causes (gout, chronic obstructive arteriosclerosis, arthritis, etc.), and other pain at the assessment site (skin diseases and trauma);
• subjects with known or suspected allergic reactions to various components of pregabalin sustained-release tablets or compounds closely related to paracetamol or paracetamol;
• subjects with clinically significant or unstable diseases, such as but not limited to severe cardiovascular disease, cerebrovascular disease, liver, kidney, respiratory system, blood system, immune system diseases, inflammatory or rheumatic diseases, uncontrolled infection, untreated endocrine diseases, etc., and other conditions that judged by the investigator to influence participation in the trial;
• subjects who have undergone renal transplantation, or are undergoing renal dialysis;
• subjects with uncontrolled narrow-angle glaucoma, uncontrolled seizure history, or uncontrolled or poorly controlled hypertension;
• Pregnant or lactating females or subjects planning to father a child during the trial (including males);
• subjects with a history of drug or alcohol abuse within one year prior to screening; patients who, in the opinion of the investigator, are not suitable for participation in this trial.