Preventive examination of a 55-year-old patient revealed diabetes mellitus. The patient hasn't received treatment for it. Objectively: height is 170 cm, weight is 106 kg, skin humidity is normal. Ps is 76 bpm, rhythmic, left border of relative heart dullness is deviated by 1 cm to the left from the middle clavicular line, heart sounds are quiet, AP is 140/80 mm Hg. Glycemia on an empty stomach is 6,9 millimole/l. Glucose rate in the daily urine is 0,5%, diuresis makes up 2,5 l. What treatment tactics should be chosen?