i am 56 years old male having diabetes since last six years. First 2 years i was diet control with good results,but since last 4 yrs iwas on metmorphin 500 mg morning and evening now since last 1month on 1gm morning and evening.my glucose level fasting is 140 ,pp 240,and before dinner is 120=130.now even with exercise ,diet control and 1gm. metmorphin it is not coming down. i am concerned about my PPglucose,please guide......some doctor have suggested combination of volglibose .2mg and metmorphin 500mg(tab. volix-m 0.2 mg) which i have not started, should i start if so tell me side effects and contra indications.