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. 1977 Jul;12(1):51–60. doi: 10.1128/aac.12.1.51

Comparison of the Curative Antimalarial Activities and Toxicities of Primaquine and Its d and l Isomers

L H Schmidt 1, Sheila Alexander 1, Linda Allen 1, Jane Rasco 1
PMCID: PMC352153  PMID: 407841

Abstract

This investigation was undertaken to determine whether either d-primaquine or l-primaquine has sufficient advantage over primaquine to warrant evaluation for curative activity in human volunteers infected with Plasmodium vivax. It was found: (i) that the capacities of the isomers and the racemate to cure infections with Plasmodium cynomolgi in rhesus monkeys were essentially identical; (ii) that the subacute toxicities of the isomers and racemate for this monkey were qualitatively the same, but that l-primaquine was three to five times as toxic as d-primaquine and at least twice as toxic as primaquine; and (iii) that the acute single-dose toxicities of the isomers for mice were not only qualitatively different, but that the d isomer was at least four times as toxic as l-primaquine. Since previous appraisals of curative activity and tolerability of 8-aminoquinolines in rhesus monkeys have correlated well with appraisals in human volunteers, attention was focused on results acquired with these test subjects. The relevant evaluations showed that d-primaquine had a therapeutic index at least twice that of primaquine. If this advantage carries over to man, problems that now complicate routine use of primaquine might be obviated. Therefore, a critical comparison of d-primaquine and primaquine in human volunteers seems indicated.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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