http://www.fda.gov/Drugs/DrugSafety/ucm223966.htm label requirements http://www.fda.gov/Drugs/DrugSafety/ucm223966.htm Drug Safety Communication http://www.fda.gov/Drugs/DrugSafety/ucm223966.htm should not be used http://www.fda.gov/Drugs/DrugSafety/ucm223966.htm FDA Safety Warnings