IRCT201106206842N1 IRCT 2012-06-27 Tehran University of Medical Sciences Chamomile Efficacy in Irritable Bowel Syndrome Chamomile Efficacy in relief of symptoms of Irritable Bowel Syndrome in Patients with Irritable Bowel Syndrome 2009-09-28 anticipated 45 Complete https://irct.ir/trial/7278 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Single, Purpose: Treatment. N/A irritable bowel syndrome. Intervention 1: 45 patients who fulfilled the ROOM II criteria and had no organic disease enrolled in this study and were asked to take Chamomile 20 drops daily for four weeks. They were asked to fill in IBS-associated symptoms questionnaire to specify abdominal pain intensity, bloating, nausea, stool consistency and altered bowel habits. Intervention 2: a prospective pre-post study in camomile use The drop was produced by Soha Jissa Company Tehran, Iran and contained bizabulol and camazolen (69.47 mg/100cc). The patients used the drop for 4 weeks, 10 drops each 12 hours, 15 minutes after meal. They had to solve it in warm water. Intervention 3: This intervention dont have any control group. This study is a comparing method between before and after camomile use in patients who use camomile.