R278474 (10-160 mg/kg; p.o. for 1 month) does not produce abnormal effects in rat, apart from liver weight increase and species-specific thyroid hypertrophy, both at the higher dose levels.
R278474 (i.v.) exhibits elimination half-life ranges from 4.4 h in rat to 31 h in dog, and exposure (AUCinf) amounts to 3.1 μg•h/mL (4 mg/kg) in rat, 8.7 μg•h/mL (1.25 mg/kg) in dog, 1.4 μg•h/mL (1.25 mg/ kg) in monkey, and 44•μg h/mL (1.25 mg/kg) in rabbit.
R278474 (p.o.) exhibits half-life ranges between 2.8 h in rat and 39 h in dog, and oral bioavailability of 32% and 31% in rat and dog.