How do you prepare medicines from vinca rosea?

Vinca rosea, also known as periwinkle, contains alkaloids like vincristine and vinblastine, which are used in cancer treatment. To prepare medicines from this plant, the leaves and stems are typically harvested and dried. They are then processed to extract the active compounds using solvents like ethanol or water, followed by purification techniques such as filtration and chromatography. The extracted alkaloids can then be formulated into various pharmaceutical forms, such as tablets or injectables, under controlled conditions.