Objective: Our aim was 2-fold: first, to assess the safety of short hydration treatment for urothelial cancer; and second, to assess the resultant quality of life of patients who received the treatment. Methods: We assessed 61 patients including 31 outpatients and 30 inpatients, who received a combination of gemcitabine and cisplatin chemotherapy with short hydration. The serum creatinine (Cr) level and the estimated glomerular filtration rate were measured to assess renal function using linear mixed model analysis. To assess quality of life, the patients were asked to respond to the Functional Assessment of Cancer Therapy-General questionnaire. The responses were then analyzed using the paired t-test. Results: Patients who received short hydration chemotherapy showed no significant change in serum Cr level (P = 0.423) or estimated glomerular filtration rate (P = 0.582). There was also no significant change in serum Cr level or estimated glomerular filtration rate between patients who received short hydration chemotherapy and those who received consecutive hydration chemotherapy (P = 0.154 and 0.311, respectively). In every patient, the Functional Assessment of Cancer Therapy-General total score and subscale scores both improved as a result of outpatient chemotherapy with short hydration (P < 0.01). Conclusions: The short hydration gemcitabine and cisplatin regimen for patients with urothelial cancer was safe. Further, the outpatient chemotherapy was found not only to be safe, but also to have improved the patients' quality of life.