hi, thanks for using healthcare magic
is a progressive illness and persons tend to move from control with lifestyle measures to needing one medication to an increase dose of that medication or addition of another and so on.
Because the pancreas
will eventually burn out, every diabetic, if they live long enough will eventually end up on insulin.
is commonly used for diabetic control, at 1000mg, it is still not at maximal dose and if your father is still having elevated readings then to option exist to increase the dose provided he is not having any side effects such as bloating,constipation
or stomach upset
In addition he may want to look at his diet to see if it can be altered in any way to optimise control.
If he is able to tolerate the maximum dose of the glycomet , eating appropriately and still having elevated blood sugars, then his doctor may consider adding another agent.
Hope this helps,