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No prominent effects of vardenafil on cognition were found : participants only made more mistakes on a reaction time task after 20 mg vardenafil .
 Chemical: vardenafil; Chemical: vardenafil
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: vardenafil; Chemical: vardenafil