I am diabetic patent from last 6 year and taking insulin everyday. Now my sex is destroying day by day, there is no erection, initially I took local viagra and had some benefit but from last 2 year it stopped giving any benefit. I have not some sex with my wife since long, I do not have bp problem and sugar level is also under control but no erection pla advice me the medicine which can aave my life, last time your docter adviced me to take megalis 20 but no benefit.