NCT07399860

Botulinum Toxin A Before Hemorrhoidectomy to Prevent Postoperative Pain

Effect of Internal Anal Sphincter Botulinum Toxin A Injection 7 Days Before Hemorrhoidectomy on Postoperative Pain: A Multicenter, Randomized, Double-Blind, Placebo-Controlled Trial

• Status: Recruiting
• Phase: Phase 2
• Study type: Interventional
• Enrollment: 292 (estimated)
• Sponsor: Lomonosov Moscow State University Medical Research and Educational Center · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

Hemorrhoidectomy is an effective surgical treatment for advanced hemorrhoidal disease but is often associated with significant postoperative pain, which may delay recovery. One of the main contributors to pain after hemorrhoidectomy is spasm and increased tone of the internal anal sphincter. This randomized, double-blind, placebo-controlled clinical trial evaluates whether preoperative injection of botulinum toxin type A into the internal anal sphincter, performed seven days before hemorrhoidectomy, can reduce postoperative pain compared with placebo. Adult patients with grade III-IV hemorrhoids scheduled for excisional hemorrhoidectomy will be randomized to receive either botulinum toxin A or saline injection prior to surgery. Postoperative pain intensity, analgesic consumption, complications, functional outcomes, and patient satisfaction will be assessed during the first 30 days after surgery.

Detailed description

This multicenter, randomized, double-blind, placebo-controlled trial is designed to investigate the effect of preoperative botulinum toxin type A injection into the internal anal sphincter on postoperative pain following excisional hemorrhoidectomy. Eligible adult patients with symptomatic grade III-IV hemorrhoids will be randomized in a 1:1 ratio to receive either botulinum toxin type A or placebo injection seven days prior to surgery. Botulinum toxin A will be injected into the internal anal sphincter in four quadrants using a standardized technique, while the control group will receive an identical volume of normal saline. Both patients and surgeons performing hemorrhoidectomy, as well as outcome assessors, will be blinded to treatment allocation. All participants will subsequently undergo open or closed hemorrhoidectomy using standardized surgical and perioperative care protocols. Postoperative pain will be assessed using a visual analogue scale during the first seven postoperative days. Secondary outcomes include analgesic consumption, postoperative complications, length of hospital stay, transient fecal incontinence, time to first bowel movement, readmissions, and patient-reported satisfaction within 30 days after surgery. The study aims to determine whether preoperative chemical sphincter relaxation with botulinum toxin A can improve postoperative recovery and reduce pain following hemorrhoidectomy.

Conditions

• Hemorrhoids
• Postoperative Pain

Interventions

Type	Name	Description
DRUG	Botulinum toxin type A	Participants receive a single preoperative injection of botulinum toxin type A into the internal anal sphincter. The injection is administered seven days prior to excisional hemorrhoidectomy. Botulinum toxin type A is injected in divided doses at predefined points of the internal anal sphincter using standard technique. The intervention is performed once and no repeat injections are planned.
DRUG	Saline (0.9% NaCl)	Participants receive a single preoperative injection of normal saline into the internal anal sphincter. The injection is administered seven days prior to excisional hemorrhoidectomy. Normal saline is injected in divided doses at the same predefined points and using the same technique and injection volume as in the experimental group. The intervention is performed once, with no repeat injections planned.

Timeline

• Start date: 2026-02-01
• Primary completion: 2027-01-01
• Completion: 2028-01-01
• First posted: 2026-02-10
• Last updated: 2026-03-10

Locations

1 site across 1 country: Russia