To summarize the current position of metal-chelating drugs in medicine
Biochemical Research Laboratory, The Dow Chemical CompanyThe metal-binding or chelating drugs have a special interest to pharmacologists because these compounds represent the unique example of "designed drugs." However, apart from the fact that their fundamental mechanism of action is usually exactly as planned, they present to the clinician almost all of the kinds of problems found in the use of any other drug. To the pharmacologist, they often present a puzzle in that some of their useful as well as some unwanted side effects seem unrelated to their metal-binding actions.The interactions of metal-binding compounds with essential metals and toxic metals obviously relate to all pharmacological science, in its broadest definition. ~ OThe literature on this subject is unusually intractable because of its age, scope~ size, and internationality. A MEDLARS literature search by tbe National Library of Medicine covering only January, 1964~ through 11arch, 1967, returned 296 citations, nearly all of which were directly pertinent (Search No. 011173). In order to write a useful review it has been necessary to restrict the literature quoted to the most recent reports, largely in English, and to hew close to the clinical line.Several previous reviews and monographs on various biological and medical aspects of chelation may be consulted. 24 , 28, 107, 184, 210,239 Valuable reviews concerning metalinduced intoxications and the use of chelating agents in their treatment also exist. 2 , 18, 23, 48, (;2, 132, 195 The practical use of the formation of a slightly dissociated metal salt of an organic compound is actually very old in medicine. A familiar in vitro example is shown in Fig.