In this randomized double-blind placebo-controlled clinical trial , we evaluated the effects of taking nettle leaf extract ( one @ mg capsule every @ hours for @ months ) combined with the conventional oral anti-hyperglycemic drugs on the blood levels of fasting glucose , postprandial glucose , glycosylated hemoglobin ( HbA@c ) , creatinine and liver enzymes SGOT and SGPT , and systolic and diastolic blood pressures in @ patients and compared with the placebo group ( n = @ ) .