Which medications in the drug class Chelation agents are used in the treatment of Heavy Metal Toxicity?

Updated: Dec 31, 2020
  • Author: Adefris Adal, MD, MS; Chief Editor: Sage W Wiener, MD  more...
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Chelation agents

These drugs supply sulfhydryl groups for the heavy metals to attach and, subsequently, may be eliminated from the body.

Dimercaprol (British Anti-Lewisite; BAL)

DOC in the treatment of lead, arsenic, and mercury toxicity. Administered via deep IM injection only, q4h, mixed in a peanut oil base. Chelates intracellular and extracellular lead and is excreted in urine and bile. First choice for patients with lead encephalopathy, in conjunction with EDTA. May be given to patients with renal failure.

Edetate calcium disodium (Calcium Disodium Versenate)

Second-line for lead toxicity. Most effective when given early in the course of acute poisoning. Chelates only extracellular lead and may induce CNS toxicity if BAL therapy not initiated first. Begin therapy 4 h after BAL is given. Only given IV, and continuous infusion is recommended.

Not recommended with renal failure. Because of potential for renal toxicity, patient should be well hydrated. To prevent hypocalcemia, use only calcium disodium salt of EDTA for chelation in heavy metal toxicity.

Penicillamine (Cuprimine, Depen)

Metal chelator used in treatment of arsenic poisoning. Forms soluble complexes with metals that are subsequently excreted in urine.

Succimer (Chemet)

Contains 2 sulfhydryl groups capable of complexing to lead, making it water soluble

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