ri·sed·ro·nate 
(rĭ-sĕdrə-nāt′)
(rĭ-sĕdrə-nāt′)n.
A bisphosphonate drug, C7H11NO7P2, that inhibits bone resorption and is used in the form of its sodium salt to treat and prevent osteoporosis in postmenopausal women.
[Perhaps (PY)RI(DINE) + -se-, origin unknown + (HY)DR(OXY) + (BISPHOSPH)ONATE.]