Primaquine or Tafenoquine for Vivax Relapse, by G6PD Result (WHO 2026)
Gives the WHO 2026 regimen to prevent vivax relapse for a G6PD result.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Weight in kg
- 60
- Age in years
- 30
- Sex
- Male
- G6PD test
- Semi-quantitative (or quantitative)
- G6PD result
- Semi-quantitative: over 70% (normal)
- Blood-stage treatment
- Chloroquine
- In South America
- No
Result: Normal G6PD activity (over 70%): primaquine 30 mg base a day for 14 days (0.5 mg/kg/day; 7 mg/kg in total).
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Weight in kg
- Age in years
- Sex
- Pregnant
- Breastfeeding an infant under 1 month
- G6PD test
- G6PD result
- Blood-stage treatment
- In South America
How this is calculated
Citation
WHO guidelines for malaria, 10 September 2026. Sections 5.2.1.5-5.2.1.7: G6PD testing (2024), tafenoquine and primaquine as anti-relapse therapy (2024), pp. 193-209. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.