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 BAL ( BRITISH ANTILEWISITE ) , DIMERCAPROL  BRAND NAME:- BAL INJ mg/2ml ( in arachis oil) inj. DIMERCAPROL is a chelating agent used as an antidote to arsenic, gold, and mercury poisoning, as well as acute lead poisoning in combination with edetate calcium disodium. PHARMACODYNAMIC:- Due to its oily nature, dimercaprol is not absorbed orally and its administration requires a deep intra-muscular injection that is extremely painful and allergenic. It was found to mobilize and relocate lead to the brain, increasing its neurotoxic effects. Despite that fact that dimercaprol increases cadmium excretion, there is an associated increase in kidney cadmium concentration. Because of this, dimercaprol must be avoided in patients with cadmium toxicity.  MECHANISM OF ACTION:- The sulfhydryl groups of dimercaprol form complexes with certain heavy metals thus preventing or reversing the metallic binding of sulfhydryl-containing enzymes. The complex is excreted in the urine.  USED:...