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This report describes the first association (exclusive of drug overdose) of symptomatic torsades de pointes occurring with the use of terfenadine in a patient who was taking the recommended prescribed dose of this drug in addition to cefaclor, ketoconazole, and medroxyprogesterone.
 ( adverse event: occurring ,  a patient: Subject, symptomatic torsades de pointes: Effect, terfenadine: Treatment, taking the recommended prescribed dose of this drug in addition to cefaclor, ketoconazole, and medroxyprogesterone: Treatment, cefaclor: Treatment.Drug, ketoconazole: Treatment.Drug, medroxyprogesterone: Treatment.Drug, terfenadine: Treatment.Drug, terfenadine: Combination.Drug, cefaclor: Combination.Drug, ketoconazole: Combination.Drug, medroxyprogesterone: Combination.Drug) 
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: occurring ,  a patient: Subject, symptomatic torsades de pointes: Effect, terfenadine: Treatment, taking the recommended prescribed dose of this drug in addition to cefaclor, ketoconazole, and medroxyprogesterone: Treatment, cefaclor: Treatment.Drug, ketoconazole: Treatment.Drug, medroxyprogesterone: Treatment.Drug, terfenadine: Treatment.Drug, terfenadine: Combination.Drug, cefaclor: Combination.Drug, ketoconazole: Combination.Drug, medroxyprogesterone: Combination.Drug) 