669
Headache relief at 2 h was 75 . 9 % for rizatriptan and 47 . 3 % for ergotamine / caffeine ( p < or = 0 . 001 ) , with rizatriptan being superior to ergotamine / caffeine within 30 min of dosing .
 Headache, rizatriptan, ergotamine, caffeine, rizatriptan, ergotamine, caffeine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Headache, rizatriptan, ergotamine, caffeine, rizatriptan, ergotamine, caffeine