Terminal illness is a disease that cannot be cured or adequately treated and that is reasonably expected to result in the death of the patient within a short period of time.he six-month standard is arbitrary, and best available estimates of longevity may be incorrect. Consequently, though a given patient may properly be considered terminal, this is not a guarantee that the patient will die within six months.
1 Stop metformin if the eGFR is below 30 ml/minute/1.73m2.  Prescribe metformin with caution for those at risk of a sudden deterioration in kidney function and those at risk of eGFR falling below 45ml/minute/1.73m2.
Patients must carefully monitor blood sugar while taking metformin so that doctors will be able to determine how well the drug is working. The NIH stresses that patients should not stop taking metformin without consulting a doctor, even if they feel well. Metformin cannot cure diabetes, only help control it.