Yes they are high concentration. You should figure out how much of it would be needed to dose your reptile and then instead of diluting it, just inject that amount under the skin of a f/t feeder and give that to your snake. I would try to find one with the lowest possible concentration to make overdosing less likely.
If your snake only takes live then you would need to dilute it with some water and a little Carnivore Care to buffer it - that's what my vet did when one of my snakes needed meds for a GI problem - and that would be tube fed to the snake.
Also I wouldn't give both at once b/c if you kill off too any parasites then a bunch can clump together and cause a blockage (at least in horses it does). I would give one medication, wait for two bowel movements, then use the other.