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Primaquine Phosphate: Brands, Price & Uses in Bangladesh
Primaquine Phosphate is an antimalarial agent (8-aminoquinoline) indicated for the following, classified by strength of evidence: Established / FDA-approved use Radical cure of vivax malaria:…
About Primaquine Phosphate
Indications of Primaquine Phosphate
Primaquine Phosphate is an antimalarial agent (8-aminoquinoline) indicated for the following, classified by strength of evidence:
Established / FDA-approved use
- Radical cure of vivax malaria: Primaquine Phosphate is indicated for the radical cure (prevention of relapse) of malaria due to Plasmodium vivax, given after acute treatment with a blood schizonticidal agent such as chloroquine. It eliminates the dormant liver-stage forms (hypnozoites) responsible for relapse.
Guideline-supported use (used in combination therapy)
- Radical cure of P. ovale malaria: Primaquine Phosphate is used, in combination with a blood schizonticide, to eliminate hypnozoites of P. ovale, based on WHO and CDC treatment guidelines, by extrapolation from its vivax indication.
- Transmission-blocking (gametocytocidal) use in falciparum malaria: A single low dose of Primaquine Phosphate added to an artemisinin-based combination therapy (ACT) is recommended by WHO to reduce transmission of P. falciparum in low-transmission or elimination settings and to help limit spread of artemisinin resistance. This is an adjunct use and is off-label under US FDA labeling.
Primaquine Phosphate must always be used together with an appropriate blood schizonticidal antimalarial for active infection; it does not treat the acute blood-stage attack on its own.
Dosage & Administration of Primaquine Phosphate
Primaquine Phosphate is taken orally, generally with food or milk to reduce gastrointestinal upset. G6PD (glucose-6-phosphate dehydrogenase) testing is required before starting treatment because of the risk of severe hemolysis (see Contraindications and Precautions).
| Indication | Typical adult dose | Duration |
|---|---|---|
| Radical cure of P. vivax/P. ovale malaria (after a blood schizonticide, e.g. chloroquine) | 15–30 mg primaquine base once daily (dose confirmed by the treating physician based on current national/WHO guidance and G6PD status) | 14 days |
| Alternative regimen for patients with mild-to-moderate G6PD deficiency (physician-supervised) | Weekly dosing at a physician-determined dose | 8 weeks |
| Gametocytocidal/transmission-blocking adjunct in P. falciparum malaria (with ACT) | Single low dose (physician-determined, weight-based) per WHO guidance | Single dose |
Exact dosing must always be individualized and confirmed by the prescribing physician; do not adjust the dose or duration of Primaquine Phosphate without medical advice.
Side Effects of Primaquine Phosphate
Most patients tolerate Primaquine Phosphate well at standard doses. Reported adverse effects include:
- Gastrointestinal: nausea, vomiting, epigastric distress, abdominal cramps (reduced by taking with food).
- Hematologic: hemolytic anemia (especially in G6PD deficiency), methemoglobinemia, leukopenia, decreased hemoglobin.
- Cardiac: QT interval prolongation, arrhythmia (uncommon).
- Other: dizziness, headache, rash, pruritus.
Patients should seek prompt medical attention for dark urine, unusual fatigue, back pain, yellowing of the skin/eyes, or bluish discoloration of lips/skin, which may indicate hemolysis or methemoglobinemia.
Contraindications of Primaquine Phosphate
- Known hypersensitivity to Primaquine Phosphate or other 8-aminoquinoline compounds.
- Severe G6PD (glucose-6-phosphate dehydrogenase) deficiency: an absolute contraindication because of the risk of severe, potentially life-threatening hemolytic anemia. G6PD testing is required before starting Primaquine Phosphate wherever testing is available.
- Pregnancy: Primaquine Phosphate is contraindicated in pregnancy owing to the risk of hemolysis in a fetus of unknown G6PD status and teratogenic findings in animal studies; treatment is deferred until after delivery (see Pregnancy and Lactation).
- Breastfeeding when the infant's G6PD status is unknown or confirmed deficient.
- Concurrent use with quinacrine.
Frequently Asked Questions about Primaquine Phosphate
What is Primaquine Phosphate used for?
Primaquine Phosphate is an antimalarial medicine used mainly for the "radical cure" of vivax and ovale malaria — it clears dormant liver-stage parasites that can cause the infection to come back after initial treatment. It is also used, as a single low dose alongside standard falciparum treatment, to help reduce further spread of the infection.
Why do I need a blood test before starting Primaquine Phosphate?
Before starting Primaquine Phosphate, your doctor will usually test for G6PD (glucose-6-phosphate dehydrogenase) deficiency. People with severe G6PD deficiency cannot safely take Primaquine Phosphate because it can cause serious breakdown of red blood cells (hemolysis).
Can I take Primaquine Phosphate during pregnancy or while breastfeeding?
Primaquine Phosphate is contraindicated in pregnancy and treatment is generally postponed until after delivery. During breastfeeding, it should only be used if the infant's G6PD status is confirmed normal. Always consult your physician before use in either situation.
What side effects should I watch for with Primaquine Phosphate?
Common side effects include nausea, stomach upset, and headache. Report dark urine, unusual tiredness, back pain, yellowing of the eyes/skin, or bluish discoloration of the lips promptly to your doctor, as these can signal hemolysis or methemoglobinemia.
What if I miss a dose of Primaquine Phosphate?
Take the missed dose as soon as you remember, unless it is nearly time for the next dose. Do not double the dose. Completing the full prescribed course of Primaquine Phosphate is essential to prevent malaria relapse, so contact your physician if you miss multiple doses.
What should I do if someone takes too much Primaquine Phosphate?
An overdose of Primaquine Phosphate can cause serious effects including irregular heartbeat, severe nausea/vomiting, and blood problems. Seek immediate medical attention or contact emergency services/poison control right away; do not attempt home treatment.
Disclaimer
The information provided is accurate to the best of our knowledge, but it does not replace professional medical advice. We cannot guarantee its completeness or accuracy, and the absence of specific information about a drug should not be taken as an endorsement. We are not responsible for any consequences arising from this information, so please consult a healthcare professional for any concerns or questions.