Company Names, addresses, dates:
  Riverside Pharmacy, 334 N Main Street, Danville VA (c.1908) ¹

Notes:
The Riverside pharmacy shows up in the 1908 Danville city directory, but not the 1917 directory, so it must have closed down sometime between those years (1908-1917). It was located at 334 N Main Street.
In previous years, 334 N Main street was the home of the F.L. Chapman and R.E. Wiley drug stores.

More information about Danville drug stores is available at rdricketts blog.

Bottles:

Clear 3.7" (1 oz) bottle embossed: horizontal on neck: 3i vertical: Riverside / PHARMACY / DANVILLE, VA. base: W T CO / A / USA