I think circulon is the same drug as navilox.
In which case this used to be prescribed loads for navicular however current thinking is that it is pretty ineffective due to the small quantity that is actually absorbed through the gut.
I haven't come accross circulon paste though so possibly a newer formulation that has a greater uptake?
From my limited experience of the powdered navilox it has been pretty ineffective when used in the treatment of feet lamenesses.