We study the distortion of p-module under non-homeomorphic mappings.f from Orlicz-Sobolev classes W-loc(1,phi) and established a strengthened form of Poletskii's inequality. This inequality was known for quasiregular mappings and conformal moduli. In addition, our estimates involve the p-outer dilatation (instead of the classical inner dilatation) and the multiplicity function. In the case of the planar domains, the condition f is an element of W-loc(1,phi) can be replaced by f is an element of W-loc(1,1).