succimer succimer succimer, sold under the brand name chemet among others, is a medication used to treat lead, mercury, and arsenic poisoning. when radiolabeled with technetium-99m, it is used in many types of diagnostic testing. a full course of succimer lasts for 19 days of oral administration. a second course should be given when more than two weeks pass after the first course. succimerclinical datapronunciation/ˈsʌksɪmər/ trade nameschemet, othersother namesdimercaptosuccinic aciddmsa(2r,3s)-2,3-dimercaptosuccinic acidmeso-2,3-dimercaptosuccinic acidaprd01236ahfs/drugs.commonographlicense data us dailymed: succimer atc codev03ab (who) legal statuslegal status us: ℞-only identifiers iupac name (2r,3s)-2,3-disulfanylbutanedioic acid cas number304-55-2 ypubchem cid2724354drugbankdb00566chemspider2006502uniidx1u2629qekeggd00572chebichebi:63623chemblchembl1201073comptox dashboard (epa)dtxsid1023601 echa infocard100.005.597 chemical and physical dataformulac4h6o4s2molar mass182.21 g·mol−13d model (jsmol)interactive imagemelting point125 °c (257 °f) smiles o=c(o)(s)(s)c(=o)o inchi inchi=1s/c4h6o4s2/c5-3(6)1(9)2(10)4(7)8/h1-2,9-10h,(h,5,6)(h,7,8)/t1-,2+ nkey:actrvobwpaiohc-xixrprmcsa-n common side effects include vomiting, diarrhea, rash, and low blood neutrophil levels. liver problems and allergic reactions may also occur with use. whether use during pregnancy is safe for the baby is unclear. dimercaptosuccinic acid is in the chelating agent family of medications. it works by binding with lead and a number of other heavy metals, allowing them to leave the body in the urine. succimer has been used medically since the 1950s. it is on the world health organization's list of essential medicines. in the united states, no generic version was available as of 2015. medical uses