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. 1984 Apr;17(4):395–404. doi: 10.1111/j.1365-2125.1984.tb02363.x

Alterations in prednisolone disposition as a result of time of administration, gender and dose.

P J Meffin, P M Brooks, B C Sallustio
PMCID: PMC1463403  PMID: 6721985

Abstract

The disposition of total and free prednisolone has been studied in four male and four female volunteers, each of whom received an intravenous dose of 0.075 mg/kg (low) and 1.5 mg/kg (high) of prednisolone at both 06.00 h and 18.00 h. For the low dose, free prednisolone clearance was 14% lower (P = 0.012) and time-averaged prednisolone free fraction was 22% higher (P less than 0.001) in the morning, there being no circadian difference in total prednisolone clearance. There was no circadian differences in prednisolone disposition at the high dose. These findings are consistent with a mechanism in which cortisol causes a simultaneous competitive inhibition of prednisolone clearance and plasma protein binding at low, but not at high prednisolone doses. Prednisolone clearance was higher in female than in male subjects, the mean increase being 18% (P = 0.022) for total prednisolone and 21% (P = 0.036) for free prednisolone. Mean total prednisolone clearance and steady-state distribution volume were two-fold higher at the high vs the low dose (P less than 0.001), but free prednisolone clearance showed a dose dependent decrease of 11% (P = 0.019). There was no change in free prednisolone steady-state distribution volume.

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Selected References

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