Can the combined treatment of solifenacin and imipramine has a role in desmopressin refractory monosymptomatic nocturnal enuresis? A prospective double-blind randomized placebo-controlled study.

BACKGROUND: Nocturnal enuresis is a common disease of childhood. It can be classified into monosymptomatic nocturnal enuresis (MNE) or nonmonosymptomatic nocturnal enuresis (NMNE). Imipramine is a tricyclic antidepressant used to treat enuresis with initial success rates are high as 50% but some studies record a high relapse rate and it has a cardiotoxic effect when overdosed. Anticholinergics may be effective in the treatment of children with bladder storage dysfunction, including daytime incontinence. However, anticholinergics monotherapy is not effective in treating MNE. In our study, we used a low dose (25 mg) of imipramine in order to avoid its potential side effects and combined it with the synergistic anticholinergic action of solifenacin. Our objective was to evaluate the efficacy and safety of the combination of solifenacin and imipramine compared with placebo in the treatment of desmopressin refractory MNE. METHODS: One hundred children aged 6 years or more with primary MNE unresponsive to desmopressin treatment were included. The children were randomly divided into two equal groups. Group A received imipramine 25 mg and solifenacin 5-10 mg oral tablets and group B received placebo once 1 h before bedtime for 3 months. The primary end point was to investigate the efficacy of the combined treatment of solifenacin and imipramine and the secondary end point was the safety of the drugs. RESULTS: Our study showed that the mean post treatment wet nights per month was significantly lesser in the treatment group than placebo group (p < 0.001) and cure rate was significantly higher in treatment group than placebo group (p < 0.001). The relapse rate was statistically significantly lower in treatment group than placebo group (p = 0.032). No significant side effects related to the drugs were reported. CONCLUSION: The combination treatment of solifenacin and imipramine is a useful and safe treatment for nocturnal enuresis after failure of everything else.