Yew is a tree. People use the bark, branch tips, and needles to make medicine.

Despite serious safety concerns, yew is used for treating diphtheria,  swollen, , muscle and , urinary tract conditions, and  conditions. 

Pharmaceutical companies make taxol, a prescription drug for the treatment of breast and ovarian cancer  from the bark of the yew tree. They extract paclitaxel, leaving the poisonous chemicals in yew behind.

How does it work?Yew might affect various parts of the body including nerves, the heart, and muscles.