458
Patients aged 18 years or older treated with prochlorperazine for headache , nausea , or vomiting were eligible for inclusion .
 prochlorperazine, headache, nausea, vomiting
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 prochlorperazine, headache, nausea, vomiting