All of the Following Are True of Drugs for Parkinsonism

All of the following are true of drugs for parkinsonism EXCEPT

A) Therapy consists of either increasing dopamine levels with the administration of levodopa or administering medications that stimulate dopamine receptors.
B) Levodopa is converted to dopamine.
C) Carbidopa (Lodosyn) must be given with other medications, such as levodopa, to have a therapeutic effect.
D) Side effects include dyskinesia, depression, diarrhea, nausea, sleep disorders, and headache.
E) They are effective in arresting the disease.