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A 53-year-old African American male with HIV was prescribed warfarin 5 mg/day for 12 months after diagnosis of idiopathic deep vein thrombosis and bilateral pulmonary emboli (target INR 2.5 [range 2.0-3.0]).
 potential therapeutic event: prescribed 
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:
 potential therapeutic event: prescribed 