Answer to Question 1
ANS: A
When administered orally, dopamine does not enter the brain. Levodopa does cross into the brain and is metabolized into dopamine. Dopamine is not available as an oral medication. The half-life of levodopa is approximately 50 minutes; the half-life of dopamine is approximately 4 days. Dopamine does not react with medications.
Answer to Question 2
ANS: A
Patients taking monoamine oxidase B inhibitors should avoid food and beverages with a high tyramine content, such as cheeses. Eggs, bread, and coffee do not have a high tyramine content.