Malaria treatment starts with antimalarial drugs prescribed by a doctor, usually taken by mouth at home unless the infection is severe

Once malaria is confirmed through a blood test, your doctor will prescribe antimalarial medication based on the type of malaria parasite you have, where you caught it, and whether the parasite in that region resists certain drugs. The most common first-line treatment in the United States is artemisinin-based combination therapy (ACT), often artemether-lumefantrine or artesunate-amodiaquine. These drugs work by killing the parasite at different life stages, which reduces the chance the parasite will develop resistance.

Most people take antimalarial pills at home for three days to a week, depending on the drug. Symptoms usually improve within 48 to 72 hours, but you must finish the full course even if you feel better—stopping early leaves parasites alive in your blood and can lead to relapse or drug resistance. If you have severe malaria, vomiting that prevents you from keeping pills down, or are pregnant, your doctor may give you intravenous artesunate in a hospital instead.

Key Takeaways

  • Antimalarial drugs are prescribed based on the parasite type and local drug resistance patterns, not all drugs work equally everywhere.
  • Most treatments are taken by mouth for three to seven days, and you must complete the full course even if symptoms stop.
  • Severe malaria, pregnancy, or inability to swallow pills may require hospital treatment with intravenous medication.
  • Side effects are common but usually mild—nausea, dizziness, and headache—and do not mean the drug is not working.
  • Your doctor will tell you which drug to take; do not buy antimalarials over the counter or online without a prescription.

Which antimalarial drug your doctor prescribes depends on where you caught malaria

The parasite that causes malaria comes in five species, and different regions have different species and different patterns of drug resistance. Plasmodium falciparum, the deadliest species, is common in Africa and increasingly resists older drugs like chloroquine. Plasmodium vivax, found in Asia and Latin America, requires a different approach because it hides in the liver and can relapse months later.

Your doctor will ask where you traveled and when, because that information tells them which parasite you likely have and which drugs work there. If you caught malaria in sub-Saharan Africa, your doctor will probably prescribe an artemisinin combination. If you have vivax malaria, you will need an additional drug called primaquine to kill the parasites hiding in your liver—but you cannot take primaquine if you have a genetic condition called G6PD deficiency, which is more common in people of African, Mediterranean, or Asian descent. Your doctor may test you for G6PD before prescribing.

What to expect while taking antimalarial medication

Antimalarial drugs work quickly. Most people feel noticeably better within two to three days as fever drops and chills stop. Your energy will return gradually over the next week or two. However, some drugs cause side effects: artemisinin combinations often cause nausea, dizziness, or headache, especially on an empty stomach. Taking your pills with food reduces nausea. Quinine, an older drug still used in some cases, can cause ringing in the ears or low blood sugar.

Do not stop taking the drug because of side effects unless your doctor tells you to. Mild nausea or dizziness is not a sign the drug is failing—it is a sign it is working. If you have severe side effects like vomiting that prevents you from keeping pills down, difficulty breathing, or confusion, contact your doctor immediately; these can mean the malaria is worsening or you need a different drug or route of administration.

Finish every dose in the bottle, even after you feel well. Parasites can survive in your blood for weeks after symptoms stop, and incomplete treatment leaves them alive to multiply again or develop resistance to the drug you took.

Severe malaria requires hospital care and intravenous treatment

Severe malaria—when the parasite damages the brain, kidneys, lungs, or blood—is a medical emergency. Signs include confusion or loss of consciousness, seizures, severe anemia, kidney failure, or difficulty breathing. If you have any of these, go to an emergency room or call 911.

In the hospital, you will receive intravenous artesunate, the most effective drug for severe malaria. Artesunate reduces death from severe malaria by about 35 percent compared to older intravenous drugs. Once you stabilize and can swallow, your doctor will switch you to oral antimalarial pills to finish the course. Hospital stays usually last five to seven days, though longer if complications develop.

Pregnancy and malaria treatment

Malaria in pregnancy is dangerous for both mother and baby—it raises the risk of miscarriage, stillbirth, and severe anemia. However, most antimalarial drugs are safe in pregnancy. Artemisinin combinations are now considered safe in the second and third trimester and are the first choice. In the first trimester, when organ development is happening, quinine is traditionally used, though some doctors now use artemisinin combinations after the first 12 weeks.

Primaquine, used to prevent relapse of vivax malaria, cannot be taken during pregnancy because it can harm the fetus. If you have vivax malaria and are pregnant, your doctor will treat the acute infection and defer primaquine until after delivery and breastfeeding (if you are breastfeeding and your baby does not have G6PD deficiency).

What happens after treatment ends

After you finish antimalarial medication, your doctor may order a follow-up blood test one to two weeks later to confirm the parasites are gone. Most people recover fully within a few weeks. Fatigue can linger for a month or longer, especially if the malaria was severe, but this improves with rest and good nutrition.

If you have vivax or ovale malaria, parasites may hide in your liver and cause relapse weeks or months later, even after successful treatment. This is why primaquine is given—it kills those hidden parasites. If you did not receive primaquine and develop fever again months after treatment, tell your doctor you had malaria, because relapse malaria responds to the same drugs.

Preventing malaria after treatment

Once you recover, you are not immune to malaria. If you travel to a malaria region again, you can catch it again. Before traveling, talk to your doctor about preventive medication (called chemoprophylaxis). The drug depends on where you are going and local resistance patterns. Doxycycline, atovaquone-proguanil, and mefloquine are common choices. You take preventive medication before, during, and after your trip.

Prevention also means protecting yourself from mosquito bites: use insect repellent with DEET or picaridin, wear long sleeves and pants at dawn and dusk when mosquitoes bite, and sleep under an insecticide-treated bed net if you are in a high-risk area.

Frequently Asked Questions

Can I buy antimalarial drugs without a prescription?

No. Antimalarial drugs sold online or over the counter without a prescription are often counterfeit, expired, or the wrong drug for the parasite you have. Counterfeit drugs do not work and can be toxic. See a doctor for diagnosis and a prescription.

How long does it take to recover from malaria?

Fever and chills usually stop within 48 to 72 hours of starting treatment. Full recovery—returning to normal energy and appetite—takes one to four weeks. If malaria was severe or caused complications, recovery takes longer.

What if the first drug does not work?

If fever and symptoms do not improve after three to five days, contact your doctor. You may have a drug-resistant parasite or a different infection. Your doctor can order a new blood test and switch you to a different antimalarial or investigate other causes.

Is malaria curable?

Yes. Antimalarial drugs cure the acute infection. However, vivax and ovale malaria can relapse if parasites hiding in the liver are not killed with primaquine. Falciparum, malariae, and knowlesi malaria do not relapse if treated correctly.

Can I catch malaria again after treatment?

Yes. Treatment cures the infection you have, but it does not make you immune. If you travel to a malaria region again, you can catch it again. Use preventive medication and mosquito protection on future trips.