14385
To test whether the reduction in exposure was due to Pgp - mediated efflux , verapamil , a known Pgp inhibitor , was dosed to the rifampin pre - treated mice which led to an increase in exposure to that obtained after a single dose of rifampin , suggesting the role of Pgp induction in reducing exposure to rifampin .
 Chemical: verapamil; Chemical: rifampin; Chemical: rifampin; Chemical: rifampin
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: verapamil; Chemical: rifampin; Chemical: rifampin; Chemical: rifampin