Paclitaxel is a chemotherapy medication commonly used in the treatment of breast, ovarian, lung, and pancreatic cancers. It is often included as part of combination chemotherapy regimens to improve treatment outcomes in selected patients.

It belongs to a class of drugs known as taxanes, which are derived from natural compounds originally found in the bark of the Pacific yew tree.

Paclitaxel works by stabilizing microtubules, which are structural components inside cells that play an essential role during cell division. By preventing these microtubules from breaking down, paclitaxel may disrupt the normal process of cell division, leading to inhibition of cancer cell growth and potentially cell death.

As it affects dividing cells, paclitaxel may also impact normal tissues, particularly those with rapidly dividing cells, such as bone marrow and hair follicles. This may result in side effects such as lowered immunity, hair loss, or nerve-related symptoms in some individuals.