Blister agent · Lablypedia

In a nutshell

A blister agent (or vesicant) is a chemical compound that causes severe skin, eye and mucosal pain and irritation in the form of severe chemical burns resulting in fluid filled blisters. Named for their ability to cause vesication, blister agent refers in common parlance to those agents which are developed for, or have been in the past utilized as chemical weapons, though some naturally occurring terpenoids such as cantharidin and T2 mycotoxin fall under this class. Exposure to blister agents is widely incapacitating, but often precipitates a delayed effect, with symptoms developing one to twenty four hours following the initial contact with the agent. Treatment for acute exposure is largely supportive, with the exception of Lewisite, for which an antidote is available. Overall lethality as a direct result of exposure is low, but increases with dose. Despite low overall lethality, blister agent exposure requires extensive supportive treatment, and can cause significant strain on medical systems. In some cases, blister agents have limited medical uses including for purposes of wart removal.

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Blister agents used in warfare

Blister agents relevant to warfare are generally divided into three categories:

Mustards - A family of related agents whose odor is similar to mustard plants, garlic, or horseradish, giving them their name. This family includes two primary subtypes:
- Sulfur mustards – A subfamily of sulfur-based agents, including what was referred to as mustard gas during World War I.
- Nitrogen mustards – A subfamily of agents similar to the sulfur mustards, but based on nitrogen instead of sulfur, of which three varieties exist which are significant to warfare.
Organoarsenics - A family of agents including ethyldichloroarsine (ED), methyldichloroarsine (MD) and phenyldichloroarsine (PD).
Lewisite – An early blister agent that was developed, but not used, during World War I. It was effectively rendered obsolete with the development of dimercaprol in the 1940s.

Some sources erroneously report phosgene oxime, a nettle agent as a blister agent. Because it causes urticaria, not vesication, the grouping is not consistent with the accepted categorization of the blister agents.

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Blister agents used in warfare

Effects

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