Query: What is the difference between Sinemet and Stalevo?
Context: Sinemet and Stalevo are both medications used to treat Parkinson's disease. They have different active ingredients. Sinemet contains levodopa and carbidopa, while Stalevo contains levodopa, carbidopa, and entacapone. The additional ingredient in Stalevo, entacapone, helps prolong the effect of levodopa in the brain.