5454
Seventy - four per cent of patients with epileptogenic disorders seen at the Emergency Unit at Groote Schuur Hospital were on phenytoin and 11.6 % of these had blood levels in the toxic range .
 blood levels in the toxic range, phenytoin
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:
 blood levels in the toxic range, phenytoin