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    Commonly Known Chemical Weapons Agents


    • Description. The same chemical that kills bacteria in public water systems can be a weapon in high concentrations. Chlorine was the first chemical weapon used effectively in war -- in World War I. It is green-yellow in color and smells like bleach.
    • Effects. It is a choking agent that irritates the eyes, nose, and respiratory tract. Symptoms of chlorine poisoning appear as runny nose, coughing, choking, and chest pain. Fluid buildup in the lungs occurs several hours after exposure. Pneumonia can follow.


    • Description. As a gas, cyanide is colorless and has a sharp, pepper-like odor. There are two kinds of cyanide, hydrogen cyanide and cyanogen chloride (cyanogen chloride turns into hydrogen cyanide inside the body).
    • Effects. They are blood agents that interfere with the use of oxygen in the body. But cyanogen chloride has strong irritating and choking effects on the eyes and respiratory tract, unlike hyrdogen cyanide. Liquid forms of cyanide will burn skin and eyes. Cyanide acts quickly, but only large amounts are deadly. Cyanide poisoning can be treated with sodium thiosulfate and hydroxocobalamin. Older treatment consisting of inhaled amyl nitrate, or intravenous sodium nitrite and sodium thiosulfate is still used in some areas.


    • Description. As a weapon, liquid Lewisite smells like a geranium and is amber to dark brown in color. The oily substance that causes blisters (a blister agent) but also can be a toxic to the lungs and poison to the whole body.
    • Effects. When inhaled in high concentrations, it can kill in as little as 10 minutes. The vapor form of Lewisite is just as dangerous, but the chemical is less effective in humid conditions. Lewisite poisoning can be treated with an antidote known as dimercarprol, if it is administered early after inhalation.


    • Description. Mustard agents are the most widely known of the blister agents and the most common. They produce injuries that heal much more slowly and are more susceptible to infection than other chemical burns.
    • Effects. Mustard also damages eyes and airways after contact, and the gastrointestinal tract and bone marrow (where immune system cells are produced) after high doses are absorbed. Its effects are delayed, though, because it causes no pain on contact. There is no antidote to mustard poisoning. Victims' eyes should be flushed with water immediately; bleach can decontaminate skin; and oxygen should be given if mustard was inhaled.
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