Chemistry of Mustard Compounds -- History of use and epidemiology of mustard compounds -- Basic pharmacology and toxicology -- Clinical pharmacology and toxicology of mustard compounds -- Delayed complications and long term effects of SM poisonings - Experience of Iraq-Iran war -- Upper respiratory complications of SM poisoning -- Lower respiratory complications of SM poisoning -- Dermatologic aspects of sulfur mustard exposure -- Ocular injury by mustard gas; early and late complications -- Immunological and hematological complications of sulfur mustard poisoning -- Psychiatric complications of sulfur mustard (SM) poisoning -- Genotoxicity, teratogenicity and mutagenicity of SM poisoning -- Verification of SM exposure in biological samples -- Occupational and environmental mustard exposure, prevention and chemical weapons convention -- Summary and conclusion.