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In dogs, no significant difference in the reduction of serum cholesterol was observed among three dosing regimens of pravastatin: once in the morning (3 mg/kg), once in the evening (3 mg/kg), and twice-daily (1.5 mg/kg x 2) for 21 days. In rabbits, pravastatin was administered at a dose of 50 mg/kg once-daily given in the evening or 25 mg/kg twice-daily for 14 days; the respective serum and liver cholesterol levels were decreased by 41% and 7% in the once-daily dosing and by 51% and 11% in the twice-daily dosing. The amount of low density lipoprotein (LDL) receptor protein was increased 1.2-1.3-fold (P &lt; 0.05) by both treatments, and no significant difference was noted between these treatment regimens. In addition, there was no significant difference in the extent of up-regulated LDL receptor protein between once-daily dosing in the evening and once-daily dosing in the morning. In the experiments with rabbit hepatocytes, the up-regulated LDL receptor activity induced by preincubation with pravastatin was retained even 24 hr after the removal of pravastatin. These results suggest that the comparable efficacy of pravastatin between once- and twice-daily treatment could be explained by retention of up-regulated LDL receptor activity for more than 24 hr in vitro and in vivo.

japanese journal of pharmacology/japanese journal of pharmacology

The Mechanism of Comparable Serum Cholesterol Lowering Effects of Pravastatin Sodium, a 3-Hydroxy-3-Methylglutaryl Coenzyme A Inhibitor, between Once- and Twice-Daily Treatment Regimens in Beagle Dogs and Rabbits