4540
PATIENTS : 46 patients who used fenfluramine or dexfenfluramine for 14 days or more and had echocardiograms obtained before therapy .
 Chemical: fenfluramine; Chemical: dexfenfluramine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: fenfluramine; Chemical: dexfenfluramine