British anti-lewisite

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A chelating agent, developed as an antidote for lewisite and other arsenical poisons. It acts by competing for the metal with the essential -SH groups in the pyruvate oxidase system of the cells and forms, with arsenic, a stable, relatively nontoxic cyclic compound, the metal having a greater affinity for it than for the -SH groups of the cell proteins; also used as an antidote for antimony, bismuth, chromium, mercury, gold, and nickel.
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British anti-lewisite

(ăn′tē-lo͞o′ĭ-sīt′, ăn′tī-)
n. Abbr. BAL
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
A sulfhydryl compound developed in World War II as an antidote to vesicant arsenical war gases which may be used as a therapeutic chelator for arsenic, lead, mercury—inorganic mercury, but not alkylmercury or phenyl mercury—and other metal poisonings; it was formerly used for chelating copper in patients with Wilson’s disease
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

Brit·ish an·ti-Lew·is·ite

(BAL) (brit'ish an'tē-lū'is-īt)
A chelating agent used in heavy-metal poisoning and against the chemical-warfare agent Lewisite.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012