The invention relates to a composition for use as a medicament comprising insulin in combination with at least one compound of formula (I) wherein the radicals R1 to R6 have the meaning according to claim 1, and/or physiologically acceptable salts thereof. Another object of the invention concerns a pharmaceutical composition comprising as active ingredients effective amounts of insulin and at least one compound of formula (I), together with pharmaceutically tolerable adjuvants, for the prophylactic or therapeutic treatment and/or monitoring of physiological and/or pathological conditions that are associated with insulin resistance. The invention also relates to a pharmaceutical package comprising insulin in a first dosage unit and at least one compound of formula (I) in a second dosage unit.