The only thing current drugs do is to help lower blood glucose, which has virtually no influence on the long-term damage due to type 2 diabetes. Most of the damage is caused by elevated insulin levels.
To reverse type 2 diabetes, our primary objective is to lower both blood sugar and insulin levels by making insulin work better. For individuals with pre-diabetes with insulin toxicity but without high blood sugar levels, our goal is to lower blood insulin levels by increasing insulin efficiency.
Diabetes is not a blood sugar disease. So, drugs that focus on the symptom of elevated blood sugar, rather than addressing the underlying cause, are doomed to fail in most cases.