Trial Outcomes & Findings for Comparison of Rimegepant and Placebo for Pain in IBS (NCT NCT06221111)

39 participants were enrolled in the study, 10 of which were excluded prior to randomization due to screening failing and 5 of which were excluded prior to randomization due to withdrawing.

Comparison of Rimegepant and Placebo for Pain in IBS

The change in daily abdominal pain scores will be assessed using the 100-mm Visual Analogue Scale (VAS). The VAS line will be 100 mm long with no intermediate delineations. Each end will be marked with "no pain" on the left, and "worst possible pain" on the right. Participants will identify their pain level by indicating a point on the line between each end. That point will be measured from the "No pain" end, and the number of millimeters will be reported as the pain score. Total scores range from 0 to 100 with higher scores indicating worse pain.

The change in bowel movement frequency measured by the number of bowel movements a participant reported having each day from baseline through day 28.

The change in rectal compliance threshold defined as the change in pressure at half maximum volume (Pr 1/2) measured using a rectal barostat device. The rectal barostat device is a rectal catheter with a polyethylene bag attached (length 22 cm; capacity 600 ml) that is inserted into the rectum and connected to a barostat. The bag is unfolded by inflation with 75 ml of air, followed by complete deflation. After a 10 minute recovery period, the pressure is increased from 0 mmHg in steps of 4 mmHg for 15 seconds per step until 20 mmHg is reached. The observed volume/maximum observed volume will be used to obtain a pressure corresponding to half the maximum observed volume. A calculation of the pressures corresponding to the volumes just above and just below the half maximum volume will provided the specific pressure (Pr 1/2) corresponding to one half of the maximum observed volume.

The change in rectal sensation pain threshold in response to the pressure in the balloon escalating from 0 mmHg to 44 mmHg at 4 mmHg stepwise increases measured using the 100-mm Visual analog scale (VAS). The scale ranges from (unnoticeable) to (unbearable). The VAS line will be 100 mm long with no intermediate delineations. Each end will be marked with "unnoticeable" on the left, and "unbearable" on the right. Participants will identify their level of pain by indicating a point on the line between each end. That point will be measured from the "unnoticeable" end, and the number of millimeters will be reported as the pain score. Total scores range from 0 to 100 with higher scores indicating worse pain.

The change in rectal sensation ratings in response to 24 mmHg and 36 mmHg distensions measured using the 100-mm Visual analog scale (VAS). The scale ranges from (unnoticeable) to (unbearable). The VAS line will be 100 mm long with no intermediate delineations. Each end will be marked with "unnoticeable" on the left, and "unbearable" on the right. Participants will identify their sensation of pain, urgency and gas levels by indicating a point on the line between each end. That point will be measured from the "unnoticeable" end, and the number of millimeters will be reported as the pain, gas and urgency scores. Total scores range from 0 to 100 with higher scores indicating worsening sensation of pain, urgency and gas.

Percentage of solids moved from the stomach to the small intestine (gastric emptying) at 4 hours on Day 28.

The scintigraphic method is used to measure colonic transit. An isotope is adsorbed on activated charcoal particles and delivered to the colon in a delayed release capsule. Anterior and posterior gamma images are taken at 4, 6, 8, 24, and 48 hours. The geometric center (GC) is the weighted average of counts in the different colonic regions. The scale ranges from 1 to 5; a high GC implies faster colonic transit, a GC of 1 implies all isotope is in the ascending colon, and a GC of 5 implies all isotope is in the stool.

The scintigraphic method is used to measure colonic transit. An isotope is adsorbed on activated charcoal particles and delivered to the colon in a delayed release capsule. Anterior and posterior gamma images are taken at 4, 6, 8, 24, and 48 hours. The geometric center (GC) is the weighted average of counts in the different colonic regions. The scale ranges from 1 to 5; a high GC implies faster colonic transit, a GC of 1 implies all isotope is in the ascending colon, and a GC of 5 implies all isotope is in the stool.

Irritable Bowel Syndrome Quality of Life (IBS-QOL) is a self-reported measure used to assess the impact of irritable bowel syndrome (IBS) on a participant's quality of life. The IBS-QOL consists of 34 items that cover eight distinct sub-domains, including emotional well-being, social functioning, dietary habits and intimate relationships. Each item is rated on a 5-point Likert scale, ranging from 1 (not at all) to 5 (a great deal). The raw scores are converted to a 0-100 scale where higher scores indicate a better quality of life.

The number of participants who experienced an Adverse Event.