Hypoglycaemia due to insulin. Level.

It depend up on when is having low sugars If he has low sugar in the middle of the night or early morning the the mixtard is the one that is responsible for low sugars and the dose need to be reduced. If he has low sugar after BF or lunch there is some mismatch between his insulin and food intake. That need to be sorted and depends on how much insulin he is taking at the moment and what his meals contain. Until the sugars gets stabilised I would ask to you to check sugars at least 3 times a day Day 1 Fasting Post breakfast and Pre dinner Next day Check post lunch and post dinner 2 hours after. This is something you can do on alternate days for at least a week . Keep a record of all the readings and come back. If anytime he is has low sugar , come back more quickly.