Catharanthine hemitartrate is primarily utilized in the field of medicinal chemistry and pharmacology. It serves as a key intermediate in the synthesis of vinca alkaloids, which are widely used in cancer chemotherapy. These alkaloids, such as vinblastine and vincristine, are effective in treating various types of cancers, including leukemia, lymphoma, and breast cancer. The compound is also studied for its potential neuroprotective properties, making it a subject of interest in research related to neurodegenerative diseases. Additionally, it is employed in biochemical studies to understand its mechanism of action and to develop new therapeutic agents with improved efficacy and reduced side effects.