Drug of choice for treatment of chloroquine resistant falciparum Malaria is
**Core Concept**
The treatment of chloroquine-resistant falciparum malaria requires a different class of antimalarial drugs that can effectively target the resistant parasites. This involves understanding the mechanisms of resistance and the pharmacological properties of various antimalarial agents.
**Why the Correct Answer is Right**
The drug of choice for treating chloroquine-resistant falciparum malaria is Artemisinin-based Combination Therapy (ACT). Artemisinin works by generating free radicals that damage the parasite's cell membrane, ultimately leading to its death. It is particularly effective against the resistant strains of Plasmodium falciparum. The combination with other antimalarial drugs like lumefantrine, mefloquine, or sulfadoxine-pyrimethamine enhances its efficacy and reduces the risk of resistance development.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because chloroquine itself is not effective against chloroquine-resistant strains of P. falciparum.
**Option B:** This option is incorrect because mefloquine, although an effective antimalarial, is not the first-line treatment for chloroquine-resistant falciparum malaria.
**Option C:** This option is incorrect because sulfadoxine-pyrimethamine is often used in combination with other antimalarials like ACT, but it is not the primary treatment for chloroquine-resistant falciparum malaria.
**Clinical Pearl / High-Yield Fact**
It's essential to note that Artemisinin-based Combination Therapy (ACT) is the recommended treatment for chloroquine-resistant falciparum malaria due to its high efficacy and low risk of resistance development. This makes ACT a crucial component in malaria treatment guidelines.
**Correct Answer:** C. Artemisinin-based Combination Therapy (ACT)