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Pharmacokinetics of the acyl coenzyme A:cholesterol acyl transferase inhibitor CP-105,191 in dogs--the effect of food and sesame oil on systemic exposure following oral dosing.

Inhibition of acyl coenzyme A:cholesterol acyl transferase (ACAT) decreases total plasma cholesterol in animals and may be an effective therapy for atherosclerosis in man. The pharmacokinetics of CP-105,191, a potent inhibitor of ACAT, were explored in fed and fasted dogs. Following oral administration of drug, mean apparent plasma half-life ranged from 9 to 16 h. Systemic availability of CP-105,191, as determined by AUC(0-infinity), was approximately 3-4-fold higher in fed dogs than in fasted dogs when 50 mg doses were administered as aqueous suspensions. Tmax was achieved more rapidly and Cmax was lower in fasted dogs. When 50 mg doses, partially dissolved in 20 mL sesame oil, were administered to fed dogs, the availability of CP-105,191 increased by another factor of 2. A 12.5 mg dose of CP-105,191, completely dissolved in sesame oil, was administered to fed and fasted dogs. Plasma AUC's were similar for fed and fasted dogs following the 12.5 mg dose, indicating that the increased availability of drug when administered with food is related to the presence of lipid.