I have been on Topomax since 2004. I have never had joint pain from it. I do get occasional numbness or tingling in my hands and feet, but this is a normal side effect. This is the list of most serious and most common side effects:
Other serious risks include decreased sweating, increased body temperature, kidney stones, sleepiness, dizziness, confusion, difficulty concentrating, and increased eye pressure (glaucoma). Call your doctor immediately if you have any decrease in vision or eye pain. These problems can lead to blindness if not treated right away.
More common side effects are tingling in arms and legs, loss of appetite, tiredness, nausea, diarrhea, taste change and weight loss.
Hope this helps!