Oxandrolone USP is used to help people regain weight they have lost due to certain medical conditions (such as surgery, chronic infection, trauma, long term use of corticosteroid medication such as hydrocortisone/prednisone). It is also used to relieve bone pain due to bone loss (osteoporosis). Oxandrolone belongs to a class of drugs known as anabolic steroids. These drugs are similar to male hormones made by the body.