Substances that may reduce the blood-glucose-lowering activity include corticosteroids, danazol, diazoxide, diuretics, glucagon, isoniazid, phenothiazine derivatives, somatropin, sympathomimetic agents (e. g. epinephrine [adrenaline], salbutamol, terbutaline), thyroid hormones, estrogens, progestins (e. g. in oral contraceptives), protease inhibitors and atypical antipsychotic medicinal products (e. g. olanzapine and clozapine).