Hypertonic drinks have a higher concentration of electrolytes (salts) and carbohydrates (sugars) as in cells, tissues and blood in the human body. Through osmosis, higher concentration of salts and sugars move towards lower concentration solution ( blood and body fluids) until the solutions reach equilibrium and become isotonic to each other.
Solute concentration of Hypertonic drink > Solute concentration of blood
Hypertonic drink forces salts and sugars into the body. This may be useful in extreme dehydration, but it may not be ideal for people with High blood pressure and diabetes.