Pfizer Inc, the world's largest drug company, has cut off drugs to several Canadian Internet pharmacies for exporting its drugs. The February 12, 2004, decision came after Pfizer issued a warning to companies in January 2004. The letter stated that pharmacies violated business agreements by either selling drugs to individuals outside of Canada or selling to others who would export them. As of press time, Pfizer officials would not comment on how many companies received the letter. The company's actions were designed to ensure the safety of patients and the honesty of the pharmaceutical supply system, according to a company statement.