This appears to be a clearance for addition use as back
in 2011 the FDA gave approval for use for patients with neurologic conditions. Treatments can be repeated and at least 12 weeks in between injections is the recommendation.
Allergan Gets FDA Approval for Using Botox To Treat Overactive Bladders
Botox with it’s freezing effect is getting more approval for different uses as it has been approved to treat cervical dystonia and for muscle spams in the wrist and finger areas of the hands. BD
The U.S. Food and Drug Administration today expanded the approved use of Botox (onabotulinumtoxinA) to treat adults with overactive bladder who cannot use or do not adequately respond to a class of medications known as anticholinergics.
Overactive bladder is a condition in which the bladder squeezes too often or squeezes without warning.
Symptoms include leaking urine (urinary incontinence), feeling the sudden and urgent need to urinate, and frequent urination. 
When Botox is injected into the bladder muscle, it causes the bladder to relax, increasing the bladder’s storage capacity and reducing episodes of urinary incontinence. Injecting the bladder with Botox is performed using cystoscopy, a procedure that allows a doctor to visualize the interior of the bladder while Botox is being injected.
http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm336101.htm
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