881
CONCLUSIONS : Careful administration is necessary in patients > or = 60 years old , in female patients , and in patients receiving a ribavirin dose of 12 mg / kg or more .
 Chemical: ribavirin
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: ribavirin