I didn't notice any sides with the diclofenac, but I see that it's generally avoided now. "Increased risk of heart attack or stroke" is the warning that bothers me, since I'm hypertensive and on blood pressure meds. Anything with risk of liver damage scares me too, since that can be cumulative can't it? I avoid Tylenol completely because of that.
Anyway I kind of tweaked my back a few weeks ago, found the diclofenac in my medicine cabinet, took two/day until I ran out two weeks later. It took care of my back almost immediately, and also was a big help with my plantar's fasciitis and my slightly arthritic index fingers. Someone at work told me I had "a spring in my step" and that's how I felt as well. I gotta get back on something like that.