man, please do NOT IV your roxy!!! oral BA is 90% trust me! i know dope heads that fiend over IV'ing substances, but they prefer to swallow oxycodone without micron-filters, but that's only if they have a full stomach. if they havent eaten in 2-4 hours then they pop em..
again, swallow your pills on an empty stomach, and eat something fatty 30-45mins after you eat em to increase BA.