Mirabig-S 50 Tablet is used to treat overactive bladder (OAB) with symptoms of urinary incontinence (urine leakage), urgent or frequent urination, increased night-time urination, and dysuria (painful or difficult urination). It works by reducing the undesirable contractions of the bladder, thereby increasing the amount of urine that the bladder can hold. Additionally, it relaxes the muscles of the bladder; this prevents frequent, uncontrolled, or urgent urination.