Many pharmacy practice positions aren't tenure track. That doesn't mean they aren't secure, but they are less secure than the faculty in the pharmaceutical sciences (which are almost always tenure track positions). When budget problems lead to a reduction in workforce, it is the staff who get let go first, and then the non-tenured faculty.
Agree with
@Dred Pirate - if security is what you are seeking, check a school's recent enrollment numbers (go back 10 years if you are able) and make sure the place isn't entering a death spiral [some schools are already dead, but nobody's told them yet].