PURPOSE: To obtain the titled molded article (e.g., rat preventing molded article) while suppressing decomposition cycloheximide, by blending a solution of cycloheximide in an organic solvent with vinyl chloride polymer pellets, removing the organic solvent and subjecting the resultant material to extrusion molding.

CONSTITUTION: A solution of cycloheximide in an organic solvent (preferably having ≤100°C boiling point, methanol, acetone, etc.) is blended with vinyl chloride polymer pellets preferably at low temperature of ≤100°C, especially ≤80°C and the organic solvent is removed by evaporation to give dried pellets wherein cycloheximide is uniformly attached to the surface of the polymer and partially penetrated into the pellets. The dried pellets are fed to an extruder and subjected to extrusion molding to give a molded article having remaining cycloheximide in a high ratio.