<unk>  (Lodosyn) is a drug given to people with Parkinson's disease in order to inhibit peripheral metabolism of levodopa. This property is significant in that it allows a greater proportion of peripheral levodopa to cross the blood–brain barrier for central nervous system effect.
Carbidopa
Ciladopa
Droxidopa
Glybuzole
Glysobuzole
Fluorodopa
Droperidol
Memantine