 Parkinsons disease PD causes several non-motor autonomic symptoms including lower urinary tract dysfunction. Their symptoms can be managed with antimuscarinics with variable efficacy. Fesoterodine offers a new therapeutic molecule to target the symptoms of urinary frequency, urgency and nocturia in this patient population. The purpose of this protocol is to compare the impact of fesoterodine to placebo on urinary urgency and nocturnal sleep problems in a heterogeneous population of PD patients in a cross-over fashion. 