104130
Amitriptyline is a popular off-label treatment for irritable bowel syndrome ( IBS ) , although it is most frequently reserved for severe cases of abdominal pain in patients with IBS because it needs to be taken regularly to work and has a generally poor tolerability profile , although a firm evidence base supports its efficacy in this indication .
 irritable bowel syndrome
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 irritable bowel syndrome