Quinine, a potent antimalarial medication, is specifically designed to combat malaria caused by the Plasmodium falciparum parasite. This particular parasite strain infiltrates red blood cells, triggering the onset of malaria.

Quinine’s mechanism of action revolves around either directly killing the parasite or impeding its growth, thus curbing the progression of the disease. It’s important to note that Quinine shouldn’t be misconstrued as a remedy for nocturnal leg cramps because its usage outside the scope of malaria treatment can lead to severe and unintended consequences.

Therefore, healthcare providers emphasize the judicious and exclusive administration of Quinine to patients diagnosed with malaria, either as a standalone therapy or in combination with other antimalarial drugs. Quinine’s efficacy in malaria treatment underscores its critical role in global healthcare strategies to combat this infectious disease, especially in regions with high mosquito activity and limited healthcare access.

Precautions and Warnings with Quinine

Before using Quinine, it’s crucial to discuss your medical history with your health care professional or pharmacist, especially if you have:

  • Previous serious side effects with Quinine, such as blood problems.
  • Family or personal history of glucose-6-phosphate dehydrogenase deficiency (G6PD), optic neuritis, hearing problems like ringing ears, myasthenia gravis, atrial fibrillation/flutter, and kidney or liver problems.
  • This medication can lead to dizziness or blurred vision. Avoid activities requiring alertness or clear vision, such as driving or operating machinery, until you know how Quinine affects you. Limit alcohol consumption, as it can exasperate dizziness. Inform your doctor if you use marijuana (cannabis).
  • Before surgery, tell your doctor or dentist about all your medications, including prescription, nonprescription, and herbal products.
  • Quinine may also cause QT prolongation, a condition affecting heart rhythm. This rare but serious condition can cause fast/irregular heartbeat, severe dizziness, and fainting and requires immediate medical attention. If you experience any of these symptoms, seek medical help promptly.

Quinine Side Effects

Quinine, while effective in treating malaria, may cause certain side effects. It is essential to be aware of common and serious side effects and take appropriate measures.

Common Side Effects

  • Nausea
  • Vomiting
  • Diarrhea
  • Dizziness
  • Headache
  • Ringing in the ears (tinnitus)

Rare Side Effects

  • Irregular heartbeat (arrhythmia)
  • Low blood sugar levels (hypoglycemia)
  • Severe skin reactions like Stevens-Johnson syndrome
  • Muscle weakness or pain
  • Seizures

Severe Side Effects

  • Allergic reactions include rash, itching, swelling of the face, tongue, or throat swelling, severe dizziness, or trouble breathing.
  • Signs of serious adverse effects like irregular heartbeat, chest pain, or dark urine.

Side Effects That Require Immediate Medical Attention

  • Persistent or worsening nausea, vomiting, diarrhea, or abdominal pain.
  • Unexplained bleeding or bruising, as Quinine can affect blood clotting.
  • Visual disturbance, including blurred vision or change in eyesight.
  • Symptoms of liver issues include yellowing of the skin or eyes (jaundice) or dark urine.
  • Unusual tiredness or weakness may indicate potential blood cell problems.

Drug Interactions with Quinine

Like most medication, Quinine has major and moderate interactions with our drugs.

Major Interactions (Avoid Completely)

Anticoagulants (Warfarin, Heparin)

Combining Quinine with anticoagulants like Warfarin or Heparin significantly increases the risk of bleeding events. This interaction should be strictly avoided unless under close medical supervision, with frequent monitoring of clotting parameters to prevent bleeding complications.


Quinine has the potential to elevate digoxin levels in the blood, which can lead to digoxin toxicity. Patients on digoxin therapy should be closely monitored for signs of toxicity, such as irregular heart rhythms or nausea if Quinine is prescribed concurrently.


Concurrent use of Quinine and amiodarone, a medication for irregular heartbeats, can increase the risk of serious arrhythmias. This combination should be avoided due to the heightened risk of cardiac complications.

Moderate Interactions (Use with Caution)

Antacids (Aluminum, Magnesium)

Antacids having aluminum or magnesium can decrease the absorption of Quinine when taken together. For minimum interaction, it is recommended that Quinine be administered at least two hours before or after taking antacids.

CYP3A4 Inhibitors

Medications that inhibit the CYP3A4 enzyme can increase Quinoline levels in the blood, potentially leading to Quinoline toxicity. Dosage adjustment and close monitoring are advised if Quinoline must be used with these inhibitors.

Statins (Atorvastatin, Simvastatin)

Combining Quinine with statins like Atorvastatin or Simvastatin (found in Vytorin) may increase the risk of statin-induced muscle problems (myopathy). To prevent complications, the patient should be monitored for muscle pain, weakness, or tenderness while on this combination.

Other Interactions to Consider


Quinine may reduce the effectiveness of corticosteroids, such as prednisone or dexamethasone, requiring careful monitoring and potential dosage adjustment of corticosteroid therapy.

Antimalarial Drugs (Chloroquine, Mefloquine)

Concurrent use of Quinine with other antimalarial drugs like Chloroquine or Mefloquine may lead to additive effects. Close monitoring for adverse reactions, such as increased side effects, is recommended when used to medicate together.

Proton Pump Inhibitors (Omeprazole, Pantoprazole)

Quinine absorption may be reduced with proton pump inhibitors (PPIs) like Omeprazole or Pantoprazole. To minimize this interaction, administer Quinine at least two hours before or after PPIs.

Strengths and Dosages of Quinine

Quinine is available at 324mg for combatting malaria caused by the Plasmodium falciparum parasite.

Recommended Dosage

The recommended dosage of Quinoline for treating uncomplicated malaria caused by Plasmodium falciparum in adults is typically 648mg every eight hours for seven days. However, dosages may vary based on the severity of the infection, the patient’s age, weight, and individual factors. Follow the specific dosage regimen your healthcare provider prescribes.

Condition Medication Strength DosageNotes
Uncomplicated MalariaQuinine324 mg2 tablets every 8 hours for 7 daysUnder the health care provider,
2 capsules should be sufficient for adults
Severe MalariaQuinine324 mg2 tablets every 8 hours forUse and dose must be determined by your physician.

Quinine Alternatives

Here is a list of medications that have the identical structure, strength, and ingredients as Quinine Tablet and can be used as alternatives:


Like Quinine, Chloroquine is an antimalarial medication that prevents the growth of the malaria parasite in red blood cells. It is available in tablet form with comparable dosages and is often used as an alternative in regions where Quinine may not be readily available.


Another antimalarial drug, Mefloquine, can be an alternative to Quinine Tablet due to its efficacy against malaria parasites. It is available in tablet form with similar strength and dosage regimens, making it a viable option for malaria treatment.

Artemisinin-based Combination Therapies (ACTs)

ACTs, such as Artemether-Lumefantrine and Artesunate-Amodiaquine, combine artemisinin derivatives with other antimalarial agents. These combinations provide potent antimalarial activity and are recommended alternatives to Quinine in some instances, especially for drug-resistant strains of malaria.


While not structurally identical to Quinoline, Doxycycline is an antibiotic sometimes used as an alternative or adjunctive therapy for malaria treatment, particularly in combination with other antimalarial drugs.


This combination of medications is effective against certain types of malaria parasites. Based on the patient’s medical history and treatment response, it can be considered an alternative to Quinine Tablet in specific situations.

Quinine FAQs

Can Quinine be used to prevent malaria?

No, Quinine is primarily used to treat malaria rather than prevent it. For malaria prevention, othr medicate such as chloroquine or atovaquone-proguanil are recommended.

What should I do if I miss a dose of Quinine?

If you miss a dose of Quinine, take it as soon as you remember. However, if it’s almost time for your next scheduled dose, skip the missed dose of your medication and continue with your regular dosing timeframe. Do not take a double dose to catch up with the missed dose.

Are there any dietary restrictions while taking Quinine?

There are no specific dietary restrictions while taking Quinine. However, having a balanced diet and staying hydrated is essential, especially if you experience gastrointestinal side effects like nausea or vomiting.

Can Quinine interact with herbal supplements or vitamins?

Yes, Quinoline can interact with certain herbal supplements or vitamins, especially those affecting blood clotting or liver function. You must inform your healthcare provider about all medications, including supplement limits, to avoid potential interactions.

How long does it take for Quinine to start working against malaria?

Quinine typically works against malaria within 24 to 48 hours after initiating treatment. However, the full course of treatment should be completed as prescribed by your healthcare provider.

Is Quinine safe for children?

Quinine may be used in children for treating malaria under close medical supervision. However, the dosage and treatment duration should be determined by a pediatrician based on the child’s age, weight, and overall health.

What are the common side effects of Quinine?

Common side effects of Quinine may include nausea, vomiting, diarrhea, dizziness, headache, and ringing in the ears (tinnitus). If the side effects continue or worsen, contact your healthcare professional.

Can Quinine cause vision problems?

Quinine has been associated with visual disorders, such as blurred vision or changes in eyesight, particularly at high doses. If you experience any vision change while taking Quinine, seek medical attention promptly.

Is Quinine available over-the-counter, or do I need a prescription?

Quinine is a prescription medication and is not available over the counter. You will require a prescription from a healthcare provider to obtain Quinine for malaria treatment.

How much does Quinine cost in America?

A Quinine oral capsule (324 mg) costs around $85 for a supply of 30 capsules, depending on the pharmacy you visit. This price variation is common and may be influenced by factors such as pharmacy location, discounts or coupons, and insurance coverage.

IMPORTANT NOTE: The information provided here is for educational purposes only and is not intended to serve as medical advice, diagnosis, or treatment recommendations. It should not be taken as an endorsement of any specific medication or treatment. Individual health conditions and responses to treatment can vary greatly; therefore, this information should not be seen as a guarantee of safety, suitability, or effectiveness for any particular individual. Always consult with a healthcare professional for personalized medical advice and before making any decisions regarding your health or treatment plans.

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