to evaluate the effect of levodopa treatment both on attention as well as acquisition and retrieval of memory tasks , parkinsonian patients were examined neuropsychologically both while medicated with levodopa/carbidopa ( `` '' on '' '' ) and when the medication 's antiparkinsonian effect had worn off ( `` '' off '' '' ) .
C0023570
levodopa
C0353697
with levodopa/carbidopa