1653
The stronger antiarrhythmic effect of ( - ) - cibenzoline indicates that ( - ) - isomer may have an effect nearly 5 - 20 times stronger in suppressing Na channels , but effects of both drugs on Ca channels may be almost equipotent .
 Chemical: cibenzoline; Chemical: Na; Chemical: Ca
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: cibenzoline; Chemical: Na; Chemical: Ca