(A) Tenofovir analyte predose median (IQR) concentration vs. time relationships for all dosing regimens: one tablet weekly, red triangle; one tablet, two times per week, green square; two tablets twice weekly, blue diamond; one tablet daily, gold circle. (B) Emtricitabine moiety predose median (IQR) concentration vs. time relationships for all dosing regimens: one tablet weekly, red triangle; one tablet, two times per week, green square; two tablets twice weekly, blue diamond; one tablet daily, gold circle.