Study of Metformin and S. Baicalensis Combination Therapy in Type 2 Diabetes Mellitus Patients

Inclusion Criteria: * Diagnosed as a diabetes mellitus patient at least 3 months ago on screening * Treated with metformin of ≥ 500 mg/day over 3 months on screening * Fasting glucose level of 110\~180 mg/dl or HbA1c of 7.0\~9.0% on screening Exclusion Criteria: * With acute or chronic inflammation * Treated with systemic corticosteroids within 4 weeks prior to the first administration of study medication * With heart failure, myocardial infarction, stroke, or other acute severe cardiovascular diseases * With acute or chronic renal failure or nephrotic syndrome * With impaired hepatic function. * Drug or Alcoholic abuser * Pregnant or nursing woman