If you have Parkinson's disease, you will likely eventually have to deal with urinary problems. Often, though not invariably, the severity of urinary dysfunction tends to correlate with the severity of the underlying Parkinson’s disease.
The most common urinary problem is the urge to go frequently. This need to urinate frequently can cause all kinds of inconveniences. One of the most troublesome is incontinence. This can sometimes be embarrassing. Another problem with frequent urination is that it disrupts your sleep. People with PD have enough problems with sleep without having to wake up and go to the bathroom every couple of hours!
So what can you do about this urge to go frequently? Most doctors recommend reducing evening fluid intake, emptying the bladder immediately before going to bed, and setting up a bedside commode so that when you need to go in the night all you have to do is sit or stand next to the bed or using diapers instead of making the trip to the bathroom.
Magerkurth C, Schnitzer R, Braune S. (2005). Symptoms of autonomic failure in Parkinson's disease: prevalence and impact on daily life. Clin Auton Res. Apr;15(2):76-82.