Quinoline alkaloids are a group of naturally occurring compounds derived from the quinoline structure. They are primarily found in various plants and have been studied for their potential medicinal properties, including antimicrobial and antimalarial effects. Some well-known examples include quinine, which is used to treat malaria, and isoquinoline derivatives. These alkaloids are characterized by their nitrogen-containing ring structures, which contribute to their biological activity. Research continues to explore their pharmacological potential, as they may offer new avenues for drug development in treating various diseases, including cancer and infectious diseases.