A pharmaceutical composition for oral administration of an active compound having a bioavailability of 20% or less. The composition comprises, based on its total weight, from 0.01% to about 15% (w/w) of said active compound molecularly dissolved in the composition, from 30 to 80% (w/w) of an edible lipid matrix and from 1 to 20% (w/w) of an edible emulsifier, the ratio between the dose weight of the active compound and its solubility in the composition being equal to or greater than 0.6 ml. The high percentage of fat (30-80%) enables a considerable increase the amount of the drug that is molecularly dispersed in the dosage form, thus allowing a significant reduction in the number of unit doses that must be taken daily-by patients.