Patients with chronic obstructive airways disease and asthma are at special risk of developing osteoporosis. Previous research has indicated that adrenal androgen levels in postmenopausal women are suppressed by short term high dose inhaled corticosteroids. Such an effect, if sustained, may be a causative factor for long term bone loss. We tested the hypothesis that postmenopausal women receiving > or = 1 mg/day inhaled beclomethasone dipropionate, long term, have suppressed dehydroepiandrosterone sulphate levels when compared to postmenopausal controls. As part of a larger study, we studied 36 postmenopausal subjects, recruited from regional pharmacies and a hospital chest clinic, who had been receiving treatment for asthma. Subjects were selected if they were receiving > or = 1 mg/day inhaled beclomethasone dipropionate (n = 27) or receiving no beclomethasone dipropionate (n = 9). The two groups were compared for dehydroepiandrosterone sulphate levels, age and potential confounders. Mean dehydroepiandrosterone sulphate levels were 35% lower in the high dose beclomethasone dipropionate group than the control group (p < 0.01). This is the first report of suppression of dehydroepiandrosterone sulphate in postmenopausal women receiving long term inhaled beclomethasone dipropionate. Further research is needed to clarify whether or not there is any associated clinically important adverse effect on bone density.