This invention relates to a pharmaceutical composition comprising a single solid oral dosage form containing an effective dose of metformin and an effective dose of glibenclamide wherein, after oral administration thereof to a human, the bioavailibility of glibenclamide is comparable to the bioavailability of glibenclamide achieved by oral administration of separate solid oral dosage forms to a human, one containing glibenclamide and the other metformin, in the same respective effective doses as in said single oral dosage form.