A Study to Evaluate Pregabalin in Painful Diabetic Peripheral Neuropathy

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 trans…