1161
While there is no single correct starting dose for levodopa therapy , many individuals can be started on either the 25 / 100 or controlled - release formula , following the general rule not to attempt to titrate carbidopa - levodopa to the point of " normality , " which can lead to toxicity .
 levodopa, carbidopa, levodopa, toxicity
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 levodopa, carbidopa, levodopa, toxicity