Hmmm - I have no experience of diabetic piggies - but as a person who is on the watch list with a pre-diabetic condition that ultimately will develop into Type 2 diabetes.......I can offer the following insights.
Diabetes is the result of an inability to keep blood sugar levels in healthy balance within the body - normally insulin is required to regulate this and it acts on cells to increase their capacity to utilise available glucose in the blood to convert ti to energy.
In Type 1 diabetes, there is a fundamental inability of the pancreas to produce sufficient insulin, often because the pancreatic cells are being destroyed. This is called insulin-dependent diabetes. In Type 2 diabetes, the body's cells become resistant to the action of insulin, the pancreas produces more and more insulin to counteract this, the cells become more and more resistant.......and finally despite loads of insulin being produced, the cells cannot respond , blood sugar levels increase and diabetes develops.. This is insulin-resistant diabetes.
So it really depends upon what type of diabetes your piggie has as to how to manage it.
Glibenclamide acts by increasing the ability of the pancreas to produce insulin. Therefore it is normally given for Type 1.
Other drugs (a common one being metformin which is what I have been prescribed) act on the cells metabolism to enable them to utilise the glucose without the need for more insulin and are used for Type 2.
If you piggie has Type 2 then I am not sure that the drug prescribed will actually help rather than contribute to the porblem. However if your piggie has Type 1 then it may be worth a shot. This next week will be the time to monitor closely to see if there is any improvement.
Obviously diet and reduction of sugar intake is also important regardless of which type of diabetes your piggie has.
Personally, should I ever have a diabetic pig, I would be looking mainly at a "natural forage" diet of hay and other dried forage (eg dandelion delight, clover and plantain mix). Fresh veggies would be restricted to lettuce, celery cucumber and fresh herbs such as parsley, dill and cilantro (ie no peppers, corn, fruit,root veg ). I would feed veg every other day (or maybe every 3 days) , with maybe the occasional treat added in of a few leaves of spinach or kale. (not broccoli florets) and would supplement with daily Vit C.
As for dried food - a very small amount of the lowest sugar-containing pellets fed (if at all) on the days where no veggies are supplied. The emphasis would be on the diet becoming mostly hay, hay and more hay - with care taken on the "cut" (time of harvest relative to growth cycle) and "type" of hay. I can;t provide more detailed information but from what I understand, first, second and third cuts of hay can vary dramatically in their sugar levels as can the type of grass.
I have already introduced this type of dietary regime to some of my piggies with long-term medical problems and it has reduced the incidences of obesity, pain when pooing and urinary issues in pre-disposed pigs. The only harmful effect is to my ears and heartstrings when they are wheeking for goodies which I know they cannot have!
I'm going to tag
@Glynis as I know she has had a diabetic piggie and perhaps she can offer more insight than me.
HTH
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whereas it's now available) and I think there's another one on the market that's also suitable but can't think of the brand. 
