A 66-year-old patient with Parki- nson's disease shows an improvement in locomotor activity after prolonged use of a certain drug which is converted to dopamine by the decarboxylation. What drug has the patient taken?

Answer options

1. Chlorpromazine
2. Celecoxib
3. Naloxone
4. Levodopa
5. Droperidol

Explanation

Parkinson’s disease occurs when there is the death of cells in the substantia nigra which leads to a decrease in the amount of dopamine. Levodopa is a precursor to dopamine used to treat this disease.