Hi, Yes, it may cause excessive urination. Cilacar (cilnidipine) is a calcium channel blocker commonly prescribed for the management of high blood pressure. Its common side effects include low blood pressure, fast heart beats, palpitations, headache, flushing, swelling of the ankles/feet, and constipation. It may also decrease the contraction of urinary bladder causing urinary retention and that can lead to overflow incontinence. However, other causes of excessive urination like urinary tract infection or diabetes must be ruled out. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Mohammed Taher Ali, General & Family Physician