  Following the recent ideas of Guillen and Silvestre in $[9]$, we prove that
the Fisher information is non-increasing along the flow of the isotropic Landau
equation. We then use this fact to deduce global existence for the equation
  $\partial_t f = (-\Delta)^{-1}f \cdot \Delta f + f^2$ under a relatively lax
set of conditions on the initial data. In particular, we remove the restrictive
radially decreasing assumption of previous works.
