glucose in artificial sweeteners

I've just been looking at the list of ingredients on a sachet of artificial sweeter. I found it is a coffee shop. The first two ingredients are dextrose and maltodextrin. If someone is trying to cut down on their sugar intake, is it not worse to have dextrose - also called glucose? It's going to have the same effect, making your blood sugar (blood glucose) levels go high. Then a drop in blood sugar level. What about diabetics? I realise that maybe there's not a great deal of dextrose and maltodextrin, with most of the sweetening coming from the two artificial sweeteners, but even so it can't be a good thing.