3973
For each of the three tested calcium channel blockers ( diltiazem , verapamil and bepridil ) 6 groups of mice were treated by two different doses , i . e . 2 and 10 mg / kg / i . p . , or an equal volume of saline for the control group ( n = 20 ) ; 15 minutes later , all the animals were injected with a single 50 mg / kg / i . p . dose of bupivacaine .
 calcium, diltiazem, verapamil, bepridil, bupivacaine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 calcium, diltiazem, verapamil, bepridil, bupivacaine