Management of recurrent urinary tract infections with patient-administered single-dose therapy.

In a randomized crossover trial, 38 women with recurrent urinary tract infections were assigned to use either continuous prophylaxis with trimethoprim-sulfamethoxazole or intermittent self-administered therapy (single-dose trimethoprim-sulfamethoxazole taken for acute urinary symptoms). The infection rate for patients on prophylaxis was 0.2 episodes/patient-year compared with 2.2 infections/patient-year for patients on self-administered therapy (p less than 0.001). Thirty-five of thirty-eight symptomatic episodes diagnosed by patients as infection were confirmed microbiologically, and 30 of the 35 infections responded clinically and microbiologically to patient-administered therapy with single-dose trimethoprim-sulfamethoxazole. No complications were seen in the 5 patients in whom therapy failed. The annual costs of prophylaxis and self-therapy were similar ($256 and $239, respectively) and both were less expensive than conventional therapy in women having 2 or more infections per year. In selected women, self-therapy is efficacious and economical compared with conventional therapy or prophylaxis.