Company Names, addresses, dates:¹
  Jas Jr Entwisle, Opposite Odd Fellows Hall, Alexandria VA (1847)
  James Jr Entwisle, King Street Opposite Sarepta Hall, Alexandria VA (1848-1855)
  James Jr Entwisle, 94 King Street, Alexandria VA (1855-1887)
  James Jr Entwisle, 404 King Street, Alexandria VA (1888-1892) ²
  John W. Entwisle, 1124 King Street, Alexandria VA (ca.1897-1901)
  John W. Entwisle, 1122 King Street, Alexandria VA (1902)
  John W. Entwisle, 1120 King Street, Alexandria VA (1903-1916)

Notes:
James Entwisle Jr (1827-1892)³ ran a drugstore in Alexandria.
Old advertisements in the Alexandria Gazette show his address to be "Opposite the new Odd Fellows Hall" in 1847, then "Opposite Sarepta Hall" from 1848-1855, and at 94 King Street starting in 1855. The 1885 Sanborn Fire map for Alexandria shows that 94 King Street was the 3rd building from east to west, between Royal & Pitt Streets. I beleive that Sarepta Hall was on this same block, so it may have been that Entwisle was at the same building the whole time, and it was just the description of his address that was changing. That's definitely true for the address change between 1887 and 1888, when the King Street addresses were changed, so 94 King Street in 1887 became 404 King Street in 1888.

John Wellington Entwistle (1871-1912)⁴ also ran a drugstore in Alexandria.
John was James Jr.'s nephew, the son of John R. Entwisle (James Jr.s brother)⁵. John W. Entwisle died of a Morphine overdose⁶.
John's drugstore was at a different address from James Jr.s, so I don't know if John took over James Jrs store & moved it, or if he just started a new drug store all on his own.

Bottles:

book # 158 (in medicines section) This is an aqua, 5.2" tall bottle with a label: label: PREPARED AND SOLD BY / JAMES ENTWISLE, JR. / Apothecary 94 King Street, / ALEXANDRIA, VA