Antimalarial drugs are medications used to prevent and treat malaria, a disease caused by parasites transmitted through the bites of infected mosquitoes. These drugs work by targeting different stages of the parasite's life cycle, helping to eliminate the infection from the body. Common antimalarial medications include chloroquine, artemisinin, and mefloquine. The effectiveness of antimalarial drugs can vary based on the type of malaria and the region where the infection occurs. Some parasites have developed resistance to certain medications, making it essential to use the appropriate drug based on local guidelines. Preventive measures, such as using insecticide-treated bed nets and indoor spraying, are also crucial in reducing malaria transmission.