Used in combination with levodopa for the treatment of Parkinson’s disease. Enhances the effect of levodopa by inhibiting its breakdown outside the brain, allowing lower doses of levodopa to be used. This reduces side effects such as nausea and vomiting. Improves motor function and helps manage symptoms like tremors, stiffness, and slowed movement. Commonly found in formulations designed for more consistent symptom control throughout the day.