2048
The pharmaceutical company producing Halfan has reported 8 cardiac arrests, leading to 6 deaths, when a higher dose than recommended was used, there was recent or concomitant treatment with mefloquine, there was pre-existing prolongation of the QT interval or the patient had a thiamine deficiency.
 ( adverse event: reported ,  8 cardiac arrests: Effect, 6 deaths: Effect, Halfan: Treatment, when a higher dose than recommended was used: Treatment, Halfan: Treatment.Drug, mefloquine: Treatment.Drug, a higher dose than recommended: Treatment.Dosage) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: reported ,  8 cardiac arrests: Effect, 6 deaths: Effect, Halfan: Treatment, when a higher dose than recommended was used: Treatment, Halfan: Treatment.Drug, mefloquine: Treatment.Drug, a higher dose than recommended: Treatment.Dosage) 