Solifenacin succinate. Molecular model of the drug solifenacin succinate (C23.H26.N2.O2?C4.H6.O4). This muscarinic antagonist is sold under the brand name Vesicare. It is used for treatment of overactive bladder with symptoms of urge urinary incontinence, urgency, and urinary frequency. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue) and oxygen (red).