Is rosemary used in medicine?

Rosemary oil is used externally to ease muscular pain, and is said to act as a stimulant to both the hair follicles and circulation in the scalp which means it is used in treatment for premature baldness.

A tea can be used in the treatment of flatulence, and sour stomach,

As a tincture it is used as a circulatory and nervine stimulant, and used where psychological tension is present.

Besides these, Rosemary also shields the brain from free-radicals, lowering the risk of Alzheimer's and Lou Gehrig's.

It also contains a number of potentially active antioxidants such as carnosic acid & rosmaric acid.

(from wikipedia.com)