Benserazide + Levodopa is a combination drug that is used in the treatment of Parkinson’s disease. Levodopa gives rise to a substance called dopamine in the body. Most of the drug is converted to dopamine by an enzyme called dopa-decarboxylase. Benserazide is a drug that inhibits the enzyme decarboxylase to decrease levodopa conversion. This combination gives rise to fewer side effects such as nausea and vomiting.