Mr. lybrate-user, Thanks for the query.
By taking Atorvastatin
2 tablets a day (20 mg per day), is unlikely to cause any such problem of increase in blood glucose. It is possible that you were earlier in a pre-diabetes
state and that condition has now changed to overt diabetes. Please tell me the earlier Fasting, PP levels if you remember. In any case if present level is showing 300 mg, then it needs to be treated. So please check
fasting, PP and HbA1c% and come back. Also inform details like your height, dietary pattern, extent of daily exercise. Also check the lipid profile. 300 mg (whether fasting or after food) is a very high glucose level, demanding urgent correction. Thanks.