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“The clearance of a number of benzodiaze-pines undergoing oxidation (chlordiazepoxide, alprazolam, diazepam) and nitro reduction (nitrazepam), theophylline, prednisolone, caffeine and cyclosporin, is reduced in oral contraceptive steroid users.”
“An investigation has now been made into whether the changes in sex steroid levels that occur during normal menstrual cycling also affect the rate of caffeine elimination , especially whether hormonal shifts in the luteal phase are associated with slower elimination of caffeine.”
Journal of environmental pathology, toxicology and oncology : official organ of the International Society for Environmental Toxicology and Cancer • 1992 | View Paper
“It is suggested that high steroid levels may in the long-term cause an altered hepatic clearance pattern affecting both steroid metabolism and caffeine elimination.”
“The administration of steroid hormones has been suggested to modulate the effects of caffeine , but unknown is whether endogenous hormone variations during the estrous cycle modulate the pharmacological effects of caffeine.”