What New Treatment Options Should We Consider For Rising HbA1c Despite Initial Improvement With Medication?

hi Dear my father have type 2 diabetic . one and half month letter we check his HBA1C and it be 11 but today we check repeat this test it shows 15 and also I should say my father give some medicine that give him in India in the first when he give that medicine the blood sugar come down but right now this medicine does not help him right now what medicine he should use if you can say?