Compared to the historical adult population receiving fosamprenavir with ritonavir 700 mg / 100 mg twice daily, a subset of five pediatric subjects ages 6 to < 24-months receiving fosamprenavir / ritonavir 45/ 7 mg/ kg twice daily demonstrated that despite an approximate 5-fold increase in fosamprenavir and ritonavir doses on a mg/ kg basis, plasma amprenavir AUC(0-τ) was approximately 48% lower, Cmax 26% lower, and Cτ 29% lower in the paediatric subjects.