Sir. My father had a heart attack on 30 Apr 17. He has been taking vildagliptin 50 + metformin 500 (OD) for the last 5 years for diabetes. He was NOT taking atorvastatin and aspirin. He has been smoking for 30 years. Angiogram shows a 90% block RCA. Angioplasty done with 2 stents and discharged on very next day. And advised to take aspirin 150 OD Clopidogrel 75 OD metoprolol 25 OD Atrovas 40 OD Metformin SR 1000 BD pantoprazole 40 OD. He stopped smoking then. AND after taking these medicines for a week his sugar level came down to 55 and 60 twice. So metformin reduced to 500 BD. Then also he is facing hypoglycemic conditions. Is vildagliptin safe to take now or continue with metformin 500 BD? And these medicines are for life long?