Welcome to HCM,
Thanks for sharing your concern to HCM,
After going through your husband is Hypertensive and Diabetic taking treatment for both,and I hope his Blood pressure and blood sugar is fairly controlled.
As he has started ACE inhibitor Perindopril
, there is drug interaction
between insulin and this drug
Perindopril increases effects of insulin regular human by pharmacodynamic synergism
and hat is why there are episodes of hypoglycemia
possibly, so you need to closely monitor his blood sugar level and if required dose of insulin may be reduced and then he will be all right.
Ace inhibitor is good drug in diabetic and has benefit apart from lowering Blood pressure so continue to take it even you may have to reduce dose of Adalat and increase the dose of Coversyl
Have faith in your doctor he may be young or old.
Please take care