The present application relates to pharmaceutical compositions and methods for treatment of urogenital diseases and bone metastasis in a human, which pharmaceutical composition contains an effective amount of arsenous acid alkaline or earth alkaline metal salt and/or a pharmaceutically acceptable adjuvant. According to the present invention, the alkaline arsenous acid metal salt is sodium meta-arsenita (AsO2Na) or potassium meta-arsenite (AsO2K). The effective amount of arsenous acid alkaline or earth alkaline metal salt is 0.0001-1500 mg/kg, preferably 1-1000 mg/kg, more preferably 1-150 mg/kg, and most preferably 50-100 mg/kg of body weight/day. The administration form of the pharmaceutical compositions of the invention is preferably oral, such as a tablet, capsule, powder and/or solution with a pharmaceutically acceptable carrier, diluent or excipient.