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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.
The potency of different venoms varies; lethal venoms are often characterised by the median lethal dose (LD50, LD50, or LD-50), expressed in terms of mass fraction (e.g., milligrams of toxin per kilogram of body mass), that will kill 50% of the target of a specified type (e.g., laboratory mice).