413
Many clinicians appear to be concerned about the potential hepatotoxicity of the opiate antagonist naltrexone ( NTX ) and this may be one reason why it is not used more widely in treating both heroin and alcohol abusers .
 adverse effect: hepatotoxicity, naltrexone; adverse effect: hepatotoxicity, NTX
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 adverse effect: hepatotoxicity, naltrexone; adverse effect: hepatotoxicity, NTX