mirfenacin mr tablets for the treatment of urinary incontinence. mirfenacin mr tablets help control the prevention of involuntary urination by preventing muscle contractions and spasms and help relax the bladder muscles and thus control urinary incontinence. They contain two substances mirabegron and solifenacin, which help reduce contraction, spasms and relaxation of the bladder muscles and lower pressure in them and thus prevent involuntary urination.