Company Names, addresses, dates:
  Cassiday's Drug Store, Fredericksburg VA (1908-1909) ^1,2
  Cassiday's Drug Store, 622 Main St, Fredericksburg VA (1909-ca.1930s/1940s) ^2,3,4

Notes:
Dr. Ferris Tower Cassiday (1879-1945)⁵ was a physician and drugstore owner in Fredericksburg Va.
He's listed in Richmond city directories from 1899-1907, first working at various drug stores including J.M. Blanks, then working as a physician.

In 1908 he's listed as having a drugstore in Fredericksburg VA¹.
In 1909 he announces he's building a new "up to date drug store" at the corner of Main and Charlotte Streets.²
The address of the new store was 622 Main Street. I believe "Main Street" refers to modern day Caroline Street.

In 1914, he announces that he wants to sell his drug store for $3000⁶.
I couldn't find any evidence that he actually sold it though, as the Cassiday's Drug Store continues to be listed as a drug store at 622 Main Street in directories and newspaper ads after that date.

Exactly when his drug store closed for good is something I couldn't find.
The last mention I could find for the Cassiday's drug store was in 1928³, however he continues to be listed as a physician up until his death in 1945. Also, a few months after his death, there is a newspaper mention that the stock and fixtures of his drug store were for sale, including things like a soda fountain and prescription counter⁴, so it's possible his drug store lasted up until that date.

This is a clear 4.7" (2 oz) mouth-blown bottle embossed: horizontal: 3ii vertical slug: CASSIDAY / Prescriptoin Druggist / FREDERICKSBURG