24592
Prolonged - release fampridine ( fampridine PR ) is a potassium channel blocker that improves conductivity of signal on demyelinated axons in central nervous system .
 Chemical: fampridine; Chemical: fampridine PR; Chemical: potassium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: fampridine; Chemical: fampridine PR; Chemical: potassium