The Flavor Changing Neutral Current mediated decays $B \rightarrow \mu^{+}\mu^{-}$ and
$B^{0} \rightarrow K^{*0}\mu^{+}\mu^{-}$ provide high sensitivity to new physics contributions. Sensitive observables
include the branching fraction, the muon forward-backward asymmetry, the fraction of $K^{*0}$ longitudinal polarisation and
the differential branching fraction. We report herein the recent results from CMS on these decay modes.