It is completely understandable to worry when your mother is still experiencing numbness. Please be reassured that nerve healing is a gradual process. The numbness is likely due to diabetic neuropathy. While metformin (Glycomet) and vildagliptin (Intaglip) manage her blood sugars, Tufgaba and Prehance are prescribed to support nerve recovery. These nerve-targeted medications often take four to six weeks to show significant improvement, so fifteen days is simply too short a time to see full results. Please continue her prescribed routine, monitor her daily blood sugars closely, and consult her doctor for a follow-up to ensure she is progressing safely.