Long-term safety and efficacy of the novel β3-adrenoreceptor agonist vibegron in Japanese patients with overactive bladder: A phase III prospective study

ObjectivesTo evaluate the long-term safety and efficacy of vibegron 50mg and 100mg, a novel (3)-adrenoreceptor agonist, in Japanese patients with overactive bladder. MethodsThis was a 1-year, multicenter, open-label, non-controlled study. After a 1-week observation phase, patients were treated with vibegron for 52weeks. When the efficacy was insufficient after an 8-week treatment with 50mg, the dose was increased to 100mg and maintained for an additional 44weeks. ResultsAmong a total of 169 patients receiving one or more doses of vibegron, 118 (69.8%) received vibegron 50mg for 52weeks, and the dose was increased to 100mg in 51 (30.2%) patients. The incidence of drug-related adverse events was 18.1% (21/116) in the vibegron 50mg group and 11.8% (6/51) in the vibegron 100mg group. Most frequent drug-related adverse events were dry mouth (3.0%), residual urine volume increased (3.0%), constipation (2.4%) and cystitis (1.8%). Statistically significant changes in overactive bladder symptom variables (daily means of micturitions, urgency episodes, urgency incontinence episodes, incontinence episodes and night-time frequency) from baseline were observed at week4 and maintained until week52. The condition of patients who did not respond well to vibegron 50mg was much improved by increasing the dose to 100mg. Vibegron improved the quality of life, and the proportion of patients' satisfaction after the treatment with vibegron was high. ConclusionsLong-term (52-week) treatment with vibegron is safe, well-tolerated and effective in patients with overactive bladder.