People have been using plants and other natural substances as medicine for thousands of years. However, the practice of professional pharmacy became its own separate professional field in the mid-nineteenth century.Pharmacists distribute prescription drugs to individuals. They also provide advice to patients and other health professionals on how to use or take medication, the correct dose of a drug, and potential side effects. Plus, they can make sure that a drug won’t interact badly with other medications you take or health conditions you have.