Magnazone 1000 mg/500 mg Injection Health Feed

I am a male, 61 years of age, suffering from Type II diabetes and hypertension since the last 17 years. I have been advised to take Human Mixtard insulin in the morning (20 units) and evening (15 units), besides other oral medications - in the morning: 1 Tab. Jalra M 50mg/500mg. For diabetes; 1 Tab Winbp 40H and in the evening: 1 Tab. Glycomet - GP 3/850, 1 Tab. Nebistar 5 mg, 1 Tab Ecosporin AV 75. Since I am on insulin, as it is, what is the rationale/need to have Jalra and Glycomet - since the metformin intake orally, exceeds 1300 mg per day?