I've been living in a world where most pharmacies double up as pseudo department / convenience…read morestores all rolled in one. In Hong Kong and most of Asia, small pharma-chains like Fanda are more geared toward beauty products and pills with very little inbetween. This location has the touristy edge for being right along Nathan Road near the A2 MTR entrance/exit with a staff that is eager to help. There is no need for appointments, just come in.
The nice thing about medicine out here is there are few restrictions on certain common meds found out west. From sleep medication to pain management to all sorts of specialty meds, it is likely here. The brand name medication is likely to be more expensive, so be prepared to seek out the generic stuff if needs be.
Calling ahead of time may prove to be problematic for non-Canto speakers, though the staff should be able to handle most requests in English. I would recommend coming prepared with a picture of the drug or brand name so they can find it quickly. They sell in bulk and also take credit card, though cash is always preferred.
No word on the beauty products, but the last time I peeped their prices for nail clippers and lotion, the markup was more significant than some of the nearby Watson's and street vendors.