Welcome to HCM
Your father is having Diabetes
and was taking Glynase
XL 5 mg which is sulfonylurea
group of oral hypoglycemic drug, as he is taking drug for last many years,secondary failure is likely to occur and his disease also must have progressed.
Even 180 mg PPBS is not bad but as he has tye II Diabetes Metformin
1000mg is logical choice more so if he is overweight
This dose of Metformin 1000mg is not overdose do not worry and his HDL is low and LDL and TG are high desirable levels are
He must have been prescribed a Statin which he should take regularly .
Take care of his diet and he should take up regular walking which will help him in control of blood sugar level and good for cardio health.