  Pressure-dependent transport measurements of Ir$_{1-x}$Pt$_x$Te$_2$ are
reported. With increasing pressure, the structural phase transition at high
temperatures is enhanced while its superconducting transition at low
temperatures is suppressed. These pressure effects make Ir$_{1-x}$Pt$_x$Te$_2$
distinct from other studied $T$X$_2$ systems exhibiting a charge density wave
(CDW) state, in which pressure usually suppresses the CDW state and enhances
the superconducting state. The results reveal that the emergence of
superconductivity competes with the stabilization of the low temperature
monoclinic phase in Ir$_{1-x}$Pt$_x$Te$_2$.
