Stalevo is a combination medication used in the treatment of Parkinson's disease and Parkinson-like symptoms that are not controlled by other medications. It contains three active ingredients: carbidopa, levodopa, and entacapone. Levodopa is converted into dopamine in the brain, helping to control movement, while carbidopa prevents the premature conversion of levodopa before it reaches the brain, ensuring a higher concentration reaches the intended site of action. Entacapone works by prolonging the effect of levodopa, providing a more stable and prolonged relief from symptoms such as stiffness, tremors, spasms, and poor muscle control. Stalevo is typically prescribed when a patient's symptoms are not adequately controlled by levodopa and carbidopa alone, offering an enhanced therapeutic effect.