I switched from Toprol xl to Metropolol tart about 2-3 months ago and since then one of my ankles, has swollen up and it is very painful to walk on. Even after being off of it, overnight, there is no relief. The swelling has been constant for the whole 2 months. Has anybody else had this kind of side effect? I am going to try going back to the name brand Toprol xl, to see if this helps, before I have a MRI done of my ankle. Already went to a orthopedic and he said I didn't have arthritis or and broken bones visual on the x-ray, and I didn't have any physical trauma to the ankle. Any help would be appreciated.