564
After starting nevirapine treatment, nine out of ten patients experienced symptoms of abstinence syndrome, and methadone dose had to be increased by 20% on average during the course of the study.
 adverse event: experienced 
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: adverse event, potential therapeutic event 
Text: {0} 
Answer:
 adverse event: experienced 