In subjects with mild hepatic impairment (Child-Pugh score of 5-6), the dosage regimen of fosamprenavir 700 mg twice daily with a reduced dosing frequency of ritonavir 100 mg once daily provided slightly higher plasma amprenavir Cmax (17%), slightly higher plasma amprenavir AUC(0-12) (22%), similar plasma total amprenavir C12 values and approximately 117% higher plasma unbound amprenavir C12 values compared to subjects with normal hepatic function receiving the standard fosamprenavir / ritonavir 700 mg / 100 mg twice daily regimen.