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We have examined the effect of systemic administration of ketamine and lidocaine on brush - evoked ( dynamic ) pain and punctate - evoked ( static ) hyperalgesia induced by capsaicin .
 ketamine, lidocaine, pain, hyperalgesia, capsaicin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 ketamine, lidocaine, pain, hyperalgesia, capsaicin