Allopurinol
"Allopurinol works extremely well for me. I am on 300 mg per day and it seems to do the trick. However, my one beef is that sometimes the pills will suddenly stop working and I have to buy a new batch. I am guessing this is because of humidity changes or temperature changes, but it is annoying. For example, about half the times I fly somewhere I find on my arrival that the pills stop working; I carry the pills in my pocket or in my carry-on while in the plane, but even so, they stop functioning. I am guessing it is the change in humidity, but who knows?"