Can taking too much diabetes medication cause hypoglycemia?

Yesterday, I took my father to the hospital.

You have diabetes, but your blood sugar control is not good.

You don't receive insulin injections or anything.

I added one more type of medication to the diabetes medication I was already taking.

When I received the prescription at the pharmacy and listened to the explanation while getting the medication

There may be a possibility of hypoglycemia.

Make sure to eat before the meal and have your rice.

You are taking the medication at about twice the strength.

I'm also worried about hypoglycemia.