Used to treat neurogenic orthostatic hypotension, a condition where blood pressure drops excessively upon standing due to nervous system disorders. It helps improve symptoms like dizziness, lightheadedness, and fainting by increasing norepinephrine levels, which constricts blood vessels and raises blood pressure. Also used in managing symptomatic neurologic conditions such as Parkinson’s disease and multiple system atrophy when orthostatic hypotension is present. The drug is particularly beneficial for patients whose daily activities are limited by low blood pressure upon standing.