791
METHODS : All patients taking Vigabatrin alone or in combination with other antiepileptic drugs for at least 5 years ( range 5 - 12 years ) were entered into a visual surveillance programme .
 Chemical: Vigabatrin
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: Vigabatrin