The law firm Siskinds LLP has launched the suit against Merck Frosst Canada, Canadian Press reported. The statement of claim alleges Merck failed to adequately warn patients and physicians that Fosamax has been associated with an increased risk of developing osteonecrosis of the jaw, or "jaw death," according to the Canadian Press. ONJ can cause pain, soft-tissue swelling and infection, loosening of teeth and exposed bone. Fosamax was approved for sale in Canada in 1995. None of the allegations have been proven in court. "We believe that through this lawsuit Merck will be required to explain to Canadian consumers what it knew about the risks associated with Fosamax and when it first became aware of those risks," Michael Peerless, a partner with Siskinds LLP, said in a statement, Canadian Press reported.