<prompt> Following drugs are known to produce osteonecrosis EXCEPTGlucocoicoidsAlcoholCytotoxicoidsNSAIDs  <response>: these NSAIDs cause gastric irritation and may risk the gastric bleeding. NSAIDs are non-specific cyclo-oxygenase inhibitors. So gastric protection and platelet function are lost.NSAIDS can also precipitate attacks of bleeding ulcers. ref:SRB;s manual of surgery,ed 3,pg no 299 