6493
A 78-year - old man with a transvenous cardioverter defibrillator system developed frequent shocks during oral procainamide therapy .
 shocks, procainamide
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 shocks, procainamide