Where did colonists get their medicine?

The American colonial period can be thought of as covering the period of 1607, when Jamestown colony was founded, to 1776, when the thirteen final colonies declared their independence. Medical care depended on where, geographically, and when, in this nearly 170-year period, a person lived.
Apothecaries in England purveyed patent medicines as early as the 1600's and these preparations, such as "Dr James's Powders and Scotch Pills, Solomon's Balm of Gilead, and Brodum's Cordial" undoubtedly made their way to the colonies.
In the absence of medicines, basic care often consisted of providing warmth, rest, and drinking water. Bloodletting and the application of leeches were often used as treatments.
Seventeenth-century colonists are known to have consulted Native American healers who used herbs and medicinal plants.
Self-help books with home remedies based on folk knowledge and advice on using plants were published as early as 1734 and later reprinted.
The first public hospital was founded in 1751 in Philadelphia as was staffed in part by physicians who had trained in Great Britain.
http://broughttolife.sciencemuseum.org.uk/broughttolife/techniques/patent