Primaquine diphosphate NEW

Specification

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Chemical & Pharmaceutical Background

• Active moiety: Primaquine

• Salt form: Diphosphate (two phosphate groups)

• Class: 8-aminoquinoline derivative

• Administration: Oral (tablets)

Primary Medical Uses

1. Radical Cure of P. vivax and P. ovale Malaria

• These malaria parasites can form dormant liver stages called hypnozoites, which can reactivate weeks or months after the initial infection, causing relapses.

• Primaquine is the only widely available drug that eliminates these hypnozoites from the liver, providing a "radical cure" (complete eradication of the parasite).

• It is typically given after a blood-stage treatment like chloroquine or artemisinin-based therapy.

2. Prevention of Relapse

• A full course (usually 14 days) of primaquine diphosphate prevents future relapses in patients infected with P. vivax or P. ovale.

3. Transmission Blocking in P. falciparum Malaria

• Primaquine can kill gametocytes (sexual forms of the malaria parasite) in P. falciparum, reducing transmission to mosquitoes.

• A single low dose (0.25 mg/kg) is often added to artemisinin-based combination therapy (ACT) in public health programs to block spread, especially in elimination campaigns.

Important Considerations & Warnings

🔴 G6PD Deficiency Risk

• Primaquine can cause severe hemolytic anemia in individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency.

• Testing for G6PD deficiency is mandatory before prescribing primaquine.

• In G6PD-deficient patients, modified regimens (e.g., weekly dosing under supervision) may be used if benefits outweigh risks.

🚫 Contraindications

• Known G6PD deficiency (unless managed carefully)

• Pregnancy (primaquine may harm the fetus; alternative strategies used)

• Severe rheumatoid arthritis or lupus (due to risk of oxidant stress)

💊 Dosage

• For radical cure: 0.25–0.5 mg base/kg/day for 14 days (dose depends on region and resistance patterns).

• Note: Dosing is based on the primaquine base, not the diphosphate salt—pharmaceutical labels specify equivalent base amounts.

Summary

• Eradicate dormant liver stages of P. vivax and P. ovale (preventing relapse),

• Block transmission of P. falciparum by killing gametocytes.

🌍 Recommended by the World Health Organization (WHO) as part of comprehensive malaria control strategies.

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