2139
Protease inhibitors (ritonavir and saquinavir) were added to the treatment and the patient developed progressive ataxia related to carbamazepine toxicity.
 adverse event: developed 
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: developed 