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Prednisolone concentrations in cerebrospinal fluid after different prednisolone prodrugs


, : Prednisolone concentrations in cerebrospinal fluid after different prednisolone prodrugs. British Journal of Clinical Pharmacology 31(1): 111-113

The concentration-time curves of prednisolone in cerebrospinal fluid (CSF) and plasma were measured following an equimolar i.v. bolus dose of prednisolone phosphate (five patients) and prednisolone phthalate (four patients). Independent of the prodrug administered, the value of the AUC (0,360 min) in CSF was more than three times lower the corresponding value in plasma. The AUCs of unbound prednisolone in plasma were higher after prednisolone phosphate, than after prednisolone phthalate (68.1 .+-. 15.7 vs 19.0 .+-. 5.2 .mu.g ml-1 min, P < 0.001). Similarly, the AUCs of prednisolone were higher in the CSF after prednisolone phosphate, than after prednisolone phthalate (17.6 .+-. 2.8 vs 3.3 .+-. 1.0 .mu.g ml-1 min, P < 0.0001). The results indicate that the concentrations of prednisolone in CSF are much lower than the unbound concentrations in plasma and that therapeutic inequivalence should be expected when the two prodrugs are given in equimolar doses.

US$19.90

PMID: 2015163

DOI: 10.1111/j.1365-2125.1991.tb03868.x


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