Those medications won't stop diabetes from progressing at all. They'll just slow the symptoms down. The underlying condition will get worse unless dietary changes and exercise reduce body fat. The only way to stop diabetes from progressing (and indeed to 'reverse' it) is to get the level of body fat reduced to the point that one has little belly fat left.

The only way to stop diabetes is to get well into the thin range of weight (BMI of 22 is ideal), to exercise, and to eat well.