Hi welcome to Health care magic..........
Atenelol belongs to the class of beta blocker
which causes glucose
intolerence means it can precipitate Diabetes
if one has it , so it is usually contraindicated in diabetic.
But the drug itself causing diabetes is unheard off.
You could have diabetes which could have been precipitated by it.
You consult your pnysician and get the drug changed to other class of anti hypertensives called ACE inihibitors , which are good in patients with diabetes and hypertension