can it be converted (aromatized) into estrogen. Since Oxandrolone is only slightly toxic and usually shows few side effects it is used by several athletes over a prolonged period of time. However Oxandrolone should not be taken for several consecutive months, since, it is also liver toxic with prolonged use. Even in small dosages, many users reported gastro-intestinal problems such as bloating, nausea, skin rash and itching, black stools, depression, unusual swelling, yellowing of the eyes or ...