Pharmacy is the health profession that links the health sciences with the chemical sciences, and it is charged with ensuring the safe use of medication. The scope of pharmacy practice includes more traditional roles such as compounding and dispensing medications on the orders of physicians, and it also includes more modern services related to patient care, including clinical services, reviewing medications for safety and efficacy, and providing drug information. Pharmacists, therefore, are experts on drug therapy and are the primary health professionals who optimize medication use to provide patients with positive health outcomes.