Proin Extended-Release is prescribed by your veterinarian to help control urinary incontinence in dogs due to urethral sphincter hypotonus, a weakening of the muscle in the urethra. It works by helping to tighten the bladder and urethral muscles to help prevent urine leaking and accidents. With all the same efficacy as Proin Chewable Tablets, these patented extended-release tablets are designed for once-a-day dosing and deliver a controlled release mechanism for steady absorption.