Hi Dear Doktor I Have Some Question What Is Normal

Hi dear doktor
i have some question
what is normal range of 2PP and FBS? while metformin has been prescibed for a patient TDS, but she has not responsive and The blood sugar(FBS) is 218mg at this 3 weeks. the patients is a 65 years old woman and the weight is 65 and height is 167cm. no cardiac problem and she is active ( housekeeper) . what is your suggestion for better control of surger. i must say she has some mental difficultis such as nervousness and insomnia Overnight. the phisician has prescibet northriptlin
Best regard
Reza, Iran, Tehran