Urinary dysfunction includes an overactive bladder (OAB), post-void residual (PVR)/retention, or both entities. Brain diseases cause OAB, peripheral neuropathies are associated with significant PVR/retention, and multisystem atrophy/spinal cord diseases result in a combination of OAB and PVR/retention. Selective beta 3 adrenergic receptor agonists or anticholinergic agents are the first-choice treatment for OAB and clean intermittent self-catheterization, alpha-blocker and cholinergic stimulant therapy for significant PVR/retention. These therapies may be useful to maximize patients' quality of life and prevent serious complications, such as urosepsis or kidney dysfunction.