Sinemet is classified as a combination medication that contains two active ingredients, carbidopa and levodopa. Carbidopa helps prevent the breakdown of levodopa before it can reach the brain and be converted to dopamine. It is primarily used to treat symptoms of Parkinson's disease.

Sinemet and Stalevo make up the dopamine replacement class of drugsd

lanoxin

No. Sinemet is a combination of a prodrug (levodopa, which is converted in the body to dopamine) and an inhibitor that prevents the conversion (the enzyme it inhibits is DOPA decarboxylase; MAOI drugs inhibit monoamine oxidase). The inhibitor is highly polar and cannot pass the blood-brain barrier, so it inhibits the conversion of levodopa to dopamine in the body generally, but allows conversion within the brain. This is done because high levels of dopamine outside the brain can result in nausea and vomiting.

the two most-commonly prescribed forms of levodopa include an amino-acid-decarboxylase (AADC) inhibitor: carbidopa (in Sinemet) or benzaseride (in Madopar).