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For a bodyweight around 70 kg (155 lb.), the lethal dose of arsenic would be closer to a gram than 100 mg. Current Queue | Current Queue for Medicine | Medicine archives Try the links in the MadSci Library for more information on Medicine.
Inorganic forms of arsenic are more toxic than organic forms. The trivalent forms are more toxic and react with thiol groups, while the pentavalent forms are less toxic but uncouple oxidative phosphorylation.