Anti Malerials

Antimalarial medications are drugs used to prevent and treat malaria, a life-threatening disease caused by Plasmodium parasites. These parasites are transmitted to humans through the bite of infected female Anopheles mosquitoes. Malaria is common in tropical and subtropical regions, particularly in parts of Africa, Asia, and South America.

​

Antimalarial drugs work by either:

• Preventing the parasite from infecting the red blood cells (prophylactic use)

• Killing the parasite once it is in the bloodstream (treatment use)

Malaria is caused by Plasmodium parasites, with the most common types being:

• Plasmodium falciparum – Most severe and life-threatening form

• Plasmodium vivax – Causes recurring infections

• Plasmodium ovale and Plasmodium malariae – Milder forms but still harmful

• Plasmodium knowlesi – A rare type found in Southeast Asia, infecting both monkeys and humans

​

The infection spreads through:

• Mosquito bites: The primary mode of transmission

• Blood transfusion: From an infected donor

• Sharing needles or syringes

• Congenital transmission: From mother to baby during childbirth

Malaria symptoms typically appear 7–30 days after the mosquito bite but may take longer in some cases. Common symptoms include:

• Fever and chills (recurring in cycles)

• Headache and muscle aches

• Fatigue and weakness

• Nausea, vomiting, and diarrhea

• Sweating and shivering

• Jaundice (yellowing of the skin and eyes in severe cases)

• Severe complications: If untreated, malaria can lead to organ failure, seizures, coma, or death.

There are several classes of antimalarial drugs, each working differently:

1. Chloroquine and Hydroxychloroquine

   • Used for both treatment and prevention

   • Effective against Plasmodium vivax, ovale, and malariae

   • Less effective against Plasmodium falciparum due to drug resistance

2. Artemisinin-based Combination Therapies (ACTs)

   • The first-line treatment for Plasmodium falciparum malaria

   • Includes drugs like artemether-lumefantrine and dihydroartemisinin-piperaquine

   • Highly effective and fast-acting

3. Mefloquine

   • Used for both prevention and treatment

   • Effective but may cause psychological side effects

4. Atovaquone-proguanil (Malarone)

   • Used for both prevention and treatment

   • Well-tolerated with fewer side effects

5. Primaquine

   • Used to treat and prevent relapses of Plasmodium vivax and Plasmodium ovale malaria

   • Not recommended for people with G6PD deficiency due to the risk of hemolysis

While antimalarials are effective, they can cause side effects. Common ones include:

• Nausea, vomiting, and diarrhea

• Dizziness or headache

• Insomnia or vivid dreams (common with Mefloquine)

• Skin rash or itching

• Blurred vision or sensitivity to light

​

Serious side effects (rare but possible):

• Heart issues: Some medications can cause irregular heartbeat

• Psychiatric effects: Mood swings, anxiety, or depression (Mefloquine)

• Hemolysis: In people with G6PD deficiency taking Primaquine

To diagnose malaria, healthcare providers use:

• Blood tests: To detect the presence of malaria parasites

• Rapid diagnostic tests (RDTs): Provide quick results in resource-limited settings

• Microscopy: Blood smear examination under a microscope to identify the parasite

• Polymerase Chain Reaction (PCR): More sensitive but less commonly used

Preventing malaria involves both drug prophylaxis and lifestyle measures:

• Medication for travelers:

  • Take antimalarial drugs before, during, and after traveling to malaria-endemic regions

• Insect repellents: Use repellents containing DEET, picaridin, or IR3535

• Mosquito nets: Sleep under insecticide-treated nets

• Clothing: Wear long-sleeved shirts and pants

• Eliminate mosquito breeding sites: Avoid standing water and keep surroundings clean

1. How long should I take antimalarial medication when traveling?

• You should start 1–2 weeks before travel, continue during your stay, and for 1–4 weeks after leaving the region, depending on the drug prescribed.

2. Can pregnant women take antimalarials?

• Yes, but only certain medications are safe, such as chloroquine and mefloquine. Pregnant women should avoid doxycycline and primaquine.

3. Can antimalarial medications be used to treat autoimmune diseases?

• Yes. Hydroxychloroquine is also used to treat lupus and rheumatoid arthritis due to its anti-inflammatory properties.

4. Do antimalarial medications provide lifelong protection?

• No. Antimalarial drugs only offer temporary protection while you are taking them. There is no malaria vaccine for lifelong immunity, although research is ongoing.

5. What should I do if I miss a dose?

• Take the missed dose as soon as you remember. If it is close to the next dose, skip the missed one. Never take double doses.