That may be simpler. Maltodextrin is a long-chain polysaccharide composed of only glucose molecules. Everything that Hammer Nutrition makes is simple sugar (disaccharide) free. I'd buy a couple packets of HEED and try them on him, see if he can digest it. Or ask your doctor. Right off, I can't think of a pure glucose commercial sports drink. But I bet you can buy it and make up your own flavored stuff.