Mittman's Pharmacy is located at 167 Havemeyer Street by South 3rd. I've only wandered around Havemeyer on weekends so it's hard for me to tell if this place is still in business. The painted decorations on the side of the shop remind me of folk art.
Update: So by chance I was wandering near Mittman's Pharmacy and yes they are still very much in business! The place is tiny inside, in fact while they did have a few small items in sale the store is pretty much only a pharmacy. It was like one of the many micro-sized Chinese take out places in he hood, except that they sell medicine instead of lo mein.