What is the role of medications in urinary incontinence treatment?

Updated: Sep 23, 2019
  • Author: Sandip P Vasavada, MD; Chief Editor: Edward David Kim, MD, FACS  more...
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Answer

The goal of therapy is to improve the symptoms of frequency, nocturia, urgency, and urge incontinence.  Pharmacologic treatment options include anticholinergics, antispasmodic agents, tricyclic antidepressants (TCAs), and beta-3-adrenergic receptor agonists.

In patients with stress incontinence, alpha agonist treatment results in contraction of the internal urethral sphincter and increases the urethral resistance to urinary flow. Sympathomimetic drugs, estrogen, and tricyclic agents increase bladder outlet resistance to improve symptoms of stress urinary incontinence.

Pharmacologic therapy for stress incontinence and an overactive bladder may be most effective when combined with a pelvic exercise regimen. The 3 main categories of drugs used to treat urge incontinence include anticholinergic drugs, antispasmodics, and TCAs.

When a single drug treatment does not work, a combination therapy such as oxybutynin (Ditropan) and imipramine (Tofranil) may be used. Although their mechanism of action differs, oxybutynin and imipramine work together to improve urge incontinence.

Oxybutynin causes direct smooth muscle relaxation of the urinary bladder and has local anesthetic properties. Imipramine has a direct inhibitory and local anesthetic effect on the bladder smooth muscle, similar to oxybutynin; however, imipramine also increases the bladder outlet resistance at the level of the bladder neck. Thus, the combination of these drugs produces a synergistic effect to relax the unstable bladder and to hold in urine and prevent urge incontinence. Potential anticholinergic adverse effects may be additive because both drugs have similar adverse reactions.

The beta-3 adrenergic receptor agonist mirabegron (Myrbetriq) causes relaxation of the detrusor miuscle and increases bladder capacity. It is indicated for overactive bladder with symptoms of urge urinary incontinence, urgency, and urinary frequency.


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