The present invention relates to naphthoquinon derivit ives and closely related compounds or tautomers or stereoiso meric forms thereof for the prophylaxis or treatment of metabolic disorders mediated by insulin resistance or hyperglycaemia, comprising diabetes type 2, inadequate glucose tolerance, insulin resistance, obesity, polycyst ic ovary syndro me (PCOS), hypertensio n and the metabolic syndrome. The invention also relates to compositions comprising a naphthoquinone derivative, a flavone derivative, warfarin or dicumarol, as an anti-diabetic agent, and to methods for prophylaxis or treatment of the above-mentioned medical conditions.
