Oral medicament comprising an osmotic laxative incorporated into a matrix based on plant fats. The present invention relates to an oral pharmaceutical composition comprising: between 30 and 55% by weight of said pharmaceutical composition of micronized anhydrous macrogol； and between 45 and 70% by weight of the pharmaceutical composition of a carrier consisting of an anhydrous hydrophobic lipid coating based on fatty compounds of plant origin, having a melting point of between 36 and 38° C., and to the use thereof as laxative. Said composition enables the reduction in the daily dosage of macrogol by preserving the osmotic pressure thereof as far as the colon, the site of therapeutic action of osmotic laxatives； said carrier protects the macrogol from a reduction, due to the moisture in the digestive tract, in the osmotic pressure.
