Final answer:
Mannitol, an osmotic diuretic, can help decrease blood pressure and increase urine output.
Step-by-step explanation:
Osmotic diuretics like mannitol promote water loss by osmosis, which can affect blood pressure and daily urine output. Mannitol, an indigestible sugar, is often administered to reduce brain swelling after a head injury. It acts as an osmotic diuretic, attracting water and causing an increase in urine output. By increasing urine output, mannitol can help decrease blood pressure.