Succimer (DMSA) is an orally active metal chelator is used to treat heavy metal poisoning. In adults Succimer is used for symptomatic lead poisoning or in patients who are asymptomatic with levels >60 micrograms/dL (>2.9 micro mol/L). In paediatrics it is used for symptomatic lead poisoning or in patients who are asymptomatic with levels >45 micrograms/dL (>2.17 micro mol/L).