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Quinine Sulfate: Brands, Price & Uses in Bangladesh
Quinine Sulfate is an antimalarial agent (cinchona alkaloid) with the following indications: Established / FDA-Approved Use Uncomplicated chloroquine-resistant Plasmodium falciparum malaria: Quinine…
About Quinine Sulfate
Indications of Quinine Sulfate
Quinine Sulfate is an antimalarial agent (cinchona alkaloid) with the following indications:
Established / FDA-Approved Use
- Uncomplicated chloroquine-resistant Plasmodium falciparum malaria: Quinine Sulfate is indicated for treatment, but it is always used in combination with a second antimalarial or antibiotic (such as doxycycline, tetracycline, or clindamycin) to shorten the duration of therapy and reduce the risk of recrudescence and resistance.
Not Recommended / Discouraged Use
- Nocturnal leg cramps: Quinine Sulfate was historically used off-label for leg cramps, but this use is now strongly discouraged due to a boxed warning for serious, life-threatening hematologic reactions (see Precautions and Warnings). Quinine Sulfate should not be prescribed or used for leg cramps.
Important: Quinine Sulfate is not used for malaria prophylaxis (prevention) and is not effective as monotherapy for falciparum malaria in most regions due to resistance concerns.
Dosage & Administration of Quinine Sulfate
Quinine Sulfate is administered orally and dosed according to indication and patient weight. It is essential to complete the full prescribed course, taken in combination with the partner drug specified by the treating physician, exactly as prescribed.
Uncomplicated Chloroquine-Resistant P. falciparum Malaria
| Population | Dose | Duration | Typically Combined With |
|---|---|---|---|
| Adults | 648 mg (salt) orally every 8 hours | 3–7 days depending on region of acquisition (longer courses, e.g. 7 days, for infections acquired in Southeast Asia) | Doxycycline, tetracycline, or clindamycin |
| Children | Approximately 8.3 mg/kg (salt) orally every 8 hours (weight-based; not to exceed adult dose) | 3–7 days as above | Clindamycin (preferred in young children and pregnant women, as doxycycline/tetracycline are generally avoided) |
Renal impairment: Dose reduction and close monitoring are recommended in patients with significant renal impairment, as drug accumulation may increase toxicity risk; consult a physician for individualized adjustment.
Hepatic impairment: Use with caution and consider dose adjustment, as Quinine Sulfate undergoes hepatic metabolism.
Quinine Sulfate must be taken exactly as prescribed by a physician; do not stop, extend, skip doses, or share this medicine with others without medical advice, as inadequate treatment can promote parasite resistance and treatment failure.
Side Effects of Quinine Sulfate
Common (Cinchonism)
Dose-related "cinchonism" is common with Quinine Sulfate and includes: tinnitus, headache, nausea, vomiting, abdominal discomfort, and mild visual disturbances. These effects are usually reversible with dose reduction or discontinuation.
Serious/Boxed Warning Effects
- Thrombocytopenia and hemolytic uremic syndrome/thrombotic thrombocytopenic purpura (HUS/TTP): Rare but serious and potentially life-threatening; can occur with even a single dose in sensitized individuals.
- Hemolytic anemia, especially in patients with G6PD deficiency.
- Hypoglycemia, due to stimulation of insulin release; more pronounced in pregnant women and those with severe malaria.
- Cardiac arrhythmias, including QT prolongation, particularly with rapid intravenous administration or overdose.
- Hepatotoxicity (uncommon).
- Hypersensitivity reactions including rash, pruritus, and rarely anaphylaxis.
Patients should seek immediate medical attention for unusual bruising/bleeding, dark urine, decreased urination, severe dizziness, palpitations, or signs of allergic reaction.
Contraindications of Quinine Sulfate
Quinine Sulfate is contraindicated in patients with:
- Known hypersensitivity to Quinine Sulfate, quinine, or quinidine.
- A history of quinine-induced thrombocytopenia, hemolytic uremic syndrome/thrombotic thrombocytopenic purpura, or other quinine-associated blood dyscrasias.
- A history of blackwater fever.
- A history of quinine-induced tinnitus or optic neuritis.
- Myasthenia gravis.
- Prolonged QT interval, and concurrent use of other drugs known to prolong the QT interval (e.g. mefloquine, halofantrine, certain antiarrhythmics).
- Glucose-6-phosphate dehydrogenase (G6PD) deficiency, due to risk of severe hemolysis.
Quinine Sulfate should not be used for the treatment or prevention of nocturnal leg cramps (see Precautions and Warnings).
Frequently Asked Questions about Quinine Sulfate
What is Quinine Sulfate used for?
Quinine Sulfate is an antimalarial medicine used, in combination with another antimalarial or antibiotic, to treat uncomplicated malaria caused by chloroquine-resistant Plasmodium falciparum. It is not used to prevent malaria and should not be used for leg cramps.
Can I use Quinine Sulfate for leg cramps?
No. Quinine Sulfate should not be used to treat or prevent nocturnal leg cramps. It carries a boxed warning for serious and life-threatening blood disorders, including thrombocytopenia and hemolytic uremic syndrome, when used for this non-approved purpose. Use Quinine Sulfate only for the malaria indication prescribed by your physician.
What are the most common side effects of Quinine Sulfate?
The most common side effects of Quinine Sulfate are grouped under "cinchonism" and include ringing in the ears (tinnitus), headache, nausea, vomiting, stomach discomfort, and blurred vision. These usually improve if the dose is adjusted, but you should tell your doctor if they are severe or bothersome.
Is Quinine Sulfate safe during pregnancy?
Quinine Sulfate should be used in pregnancy only if clearly needed, since untreated falciparum malaria can be dangerous for both mother and baby. However, Quinine Sulfate increases the risk of low blood sugar (hypoglycemia), especially in pregnancy, so it must be used only under close medical supervision. Always consult your physician before use during pregnancy or while breastfeeding.
Who should not take Quinine Sulfate?
Quinine Sulfate should not be taken by people who are allergic to quinine or quinidine, have a past history of quinine-related blood disorders (such as thrombocytopenia or hemolytic uremic syndrome), have G6PD deficiency, myasthenia gravis, a prolonged QT interval, or a history of tinnitus/optic neuritis from quinine, or by anyone taking other medicines that prolong the QT interval. Discuss your full medical history with your physician before starting Quinine Sulfate.
What should I do if I miss a dose or suspect an overdose of Quinine Sulfate?
If you miss a dose of Quinine Sulfate, take it as soon as you remember unless it is close to the time for your next dose — do not double the dose. If you suspect an overdose of Quinine Sulfate, this is a medical emergency: seek immediate medical attention or contact emergency services/poison control right away, as overdose can cause dangerous heart rhythm problems, severe low blood pressure, vision or hearing loss, and seizures.
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.