Salam Doaa,
I haven't worked in a pharmacy to comment on the use of crew in that context, but there are two things I would like to point out:
1. The word "staff" definitely is used in the context of pharmacies. There are numerous official examples of this usage in both the U.S. and Britain, such as the following:
http://www.uhb.nhs.uk/pharmacy-staff.htmhttp://spahp.creighton.edu/welcome-cumc-pharmacy/meet-staff2. The word "crew" has multiple meanings. It can mean the people who work together, but it can also mean a group of friends. In each of the specific examples you gave, the word is being used in a more informal way:
http://news.google.com/newspapers?nid=1893&dat=19711222&id=C...In the first example, they are talking about a pharmacy, a McDonald's restaurant, and some stores competing against each other in a sporting event. From the context, it is clear that the word "crew" is used in a way to show you that the people work together, but they are also buddies who play together on a team.
To be continued in a second post due to space limitations...