Pigmented rats: uveal tract and skin levels 2-330-fold higher than in albino rats, with slower elimination
“The concentration of [14C]-avapritinib-derived radioactivity in the uveal tract and skin of pigmented Long Evans rats was eliminated more slowly and was approximately 2 to 330-fold higher than in these tissues in nonpigmented rats.”
CNS toxicity: convulsions in rats, possibly via Nav1.2 inhibition, at >=8x clinical exposure
“Rats manifested convulsions, which was potentially secondary to inhibition of Nav 1.2 at systemic exposures ≥8-fold higher than the exposure in patients at the clinical dose of 300 mg once daily.”