Patients with kidney failure have decreased urine output. Once the patient goes on dialysis, the urine output gradually decreases over a period of time. However, patients on peritoneal dialysis usually retain their urine output for a longer time. Hence, they would need less restriction on fluid intake. But once the urine output decreases markedly, one would need to be cautious in their daily fluid intake so as to avoid fluid retention. Decreased urine output would not have any adverse effect on your health as long as you follow daily fluid restriction along with an adequate dialysis treatment as prescribed by your nephrologist.