Vibrating Capsules for Constipation: The Phase-Three Trial

Who was studied

The eight-week trial compared five weekly vibrating capsules with nonvibrating capsules in 312 adults, mostly women, with chronic idiopathic constipation despite laxatives. IBS-C and pelvic-floor disorders were excluded.¹

What improved

In the published analysis, 64/163 (39.3%) versus 33/149 (22.1%) gained ≥1 additional complete spontaneous bowel movement weekly in ≥6/8 weeks; 37/163 (22.7%) versus 17/149 (11.4%) gained ≥2. Complete meant feeling empty, without manual help or rescue medication within 48 hours. Most participants did not reach either threshold.¹

Another 37 received a mode dropped at interim; enrollment increased. Missing diary days counted zero; under six weeks of records meant nonresponse. Eleven percent felt vibration. Eight weeks cannot establish long-term safety. Vibrant funded the study; authors reported company ties.¹

Before a prescription

Vibrant is a US prescription device for adults whose chronic idiopathic constipation persists despite recommended laxative doses for at least a month. A pod activates each capsule before swallowing. Follow the supplied instructions and prescribed schedule.²

Contraindications include suspected obstruction, significant gastroparesis, swallowing disorders, inflammatory bowel disease, pregnancy and breastfeeding. It is MR unsafe: before MRI, the physician must verify capsule expulsion by abdominal X-ray. Discuss implanted devices. Stop further capsules and contact the physician immediately for black/bloody stools, unusual or persistent abdominal pain, nausea/vomiting, or suspected failure to pass a capsule. Use beyond eight weeks requires reassessment.²

The American Gastroenterological Association’s 2026 expert advice considers a vibrating capsule a reasonable adjunct for refractory constipation. Most patients should have anorectal testing and, when indicated, pelvic-floor biofeedback before that label. Review secondary causes and prior medication trials with the clinician.³

Bloated by Dinner explains the main laxative families and two pharmacy questions: which family is this, and how long is it intended for? Bring your previous products and treatment dates to the device discussion. See the book.