Botulinum Toxin Treatment of Pelvic Floor Disorders and Genital Pain in Women

Background and Objective Botulinum neurotoxin (BoNT), now commonly used for reducing muscular spasms in other neuromuscular disorders, is now increasingly proposed also for treating pelvic floor disorders, including chronic pelvic pain syndromes, vaginismus, vulvodynia and vulvar vestibulitis syndrome. To provide up-to-date information on these advances we reviewed the literature about Bunt injections for pain and spasms related to pelvic floor disorders. Methods We conducted a Medline search using the terms botulinum neurotoxin, pelvic floor disorders, levator ani myalgia, vaginismus, vulvar vestibulitis , vulvodynia, dyspareunia, interstitial cystitis, recurrent cystitis, and postcoital cystitis. We sought information on the indications and techniques used for Bunt treatment for pelvic floor dysfunctions, and related pain syndromes in women. Results Our search identified 12 studies for review (including a randomized controlled trial) showing that Bunt effectively reduces pain in chronic genital pain syndromes associated with pelvic floor spasm. Before Bunt trials, patients with idiopathic lifelong vaginismus and dyspareunia, associated with hyperactive pelvic floor muscles, had no effective treatment options. Bunt injected under electromyographic (EMG) guidance in pelvic floor muscles improves vaginismus, helping to restore a normal sexual life. Bunt injections also seem to improve vulvodynia and vulvar vestibulitis. Though some patients need periodic injections, in about 65% of affected women BoNT achieves permanent benefit. Conclusions These encouraging evidence-based results suggest that BoNT injected intramuscularly should extend treatment options for women with lifelong or acquired pelvic floor disorders and genital pain.