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Modern malaria chemoprophylaxis.

G Dennis Shanks1, Michael D Edstein

  • 1Australian Army Malaria Institute, Brisbane, Queensland, Australia. george.d.shanks@us.army.mil

Drugs
|October 18, 2005
PubMed
Summary

New malaria chemoprophylaxis drugs are needed due to resistance and side effects. Tafenoquine, an 8-aminoquinoline, shows promise for weekly use, but glucose 6-phosphate dehydrogenase testing is crucial for both it and primaquine to prevent hemolysis.

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Area of Science:

  • Tropical Medicine
  • Pharmacology
  • Infectious Diseases

Background:

  • Existing malaria chemoprophylaxis faces challenges including drug resistance, patient compliance, and adverse effects.
  • Primaquine, an established treatment, can prevent malaria daily, but requires glucose 6-phosphate dehydrogenase (G6PD) testing.
  • Mefloquine use is declining due to concerns over neuropsychiatric side effects.

Purpose of the Study:

  • To review the need for novel malaria chemoprophylaxis agents.
  • To discuss the potential of tafenoquine, a new 8-aminoquinoline, as a malaria preventive.
  • To highlight the importance of G6PD testing for 8-aminoquinolines and consider other emerging antimalarials.

Main Methods:

  • Review of current literature on malaria chemoprophylaxis.
  • Analysis of clinical trial data for tafenoquine efficacy and dosing.
  • Evaluation of safety profiles and G6PD testing requirements for antimalarial drugs.

Main Results:

  • Tafenoquine demonstrates efficacy for malaria prevention and allows for less frequent dosing (weekly) compared to primaquine.
  • Both primaquine and tafenoquine necessitate G6PD deficiency screening to avoid drug-induced hemolytic anemia.
  • Other drug classes, including antifols and Mannich bases, are in advanced preclinical development.

Conclusions:

  • Novel malaria chemoprophylaxis options like tafenoquine are essential to address limitations of current drugs.
  • Careful patient selection and G6PD status assessment are critical for safe and effective malaria prevention.
  • A multifaceted prevention strategy, including antimalarial medication and mosquito control, is vital for high-risk travelers.

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