I have been using Oxybuytin for several years. I also take other medication and usually keep track of side effects to help with my med use. In the past couple of years I have notices issues with blurred Vision, memory issues (think clearly/remembering things) and constipation. Some of this I have contributed to age. I no longer feel this is the case. I believe I remember that this drug should not be taken over long periods of time. I also take Lamotrigine (200 mg x 2 daily). I understand that this med may interact with Oxybutin. Can you help?