Do not stop taking Istamet without first consulting a doctor because your blood sugar levels are extremely high. Sitormet, Dppmet, and other generic names that are sold in India are typically less expensive substitutes that include the same combination of sitagliptin 50 mg + metformin 500 mg. If the composition is exactly the same, certain generic variants might be significantly less expensive while functioning identically. However, because your fasting blood sugar was approximately 320, it is crucial to consult your diabetologist before switching medications because you might also require a stronger course of therapy or a dose change. Maintain strict sugar monitoring, regular walking, and food control.