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In this commentary , evidence from pharmacokinetic , pharmacodynamic , imaging , pharmacogenetic , and pharmacovigilance studies , along with drug safety reports , is presented supporting a low probability of inhibiting efflux transporters at the human blood - brain barrier by currently marketed drugs . Clinical Pharmacology & Therapeutics ( 2013 ) ; accepted article preview 14 February 2013 doi : 10 . 1038 / clpt . 2013 . 34 .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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