If you need an after-hours pharmacy, try one of these chain or independent stores.

Click for a Regional List with addresses and  phone numbers.

Or, if you live in Manhattan , you can click below for one of the maps and then click  one of the logos for exact address and phone number. 

You should call first to be certain your chosen pharmacy is, in fact, open.

MAPS
Upper Manhatten - Upper 50s to 90s
Midtown - Upper 20s to Mid 60s
Downtown - 20s to Division Street

You can also check this external database of Manhattan listings.
http://www.citidex.com/2529.htm#C713