Pharmacy school teaches Calculus. Why would that be? Do you need to run derivatives and integrals to fill prescriptions?
No. Teaching maths, particularly calculus, teaches people how to 1) not make mistakes and 2) catch your own mistakes quickly. Vitally important skills for someone filling out live-saving medicine.
A calculus class should ideally be making someone think much harder than that. Calculus is about understanding the relationships involved with continuous quantities and modeling the way things move and change. It is a basic prerequisite for understanding biochemistry and statistics, essential background for understanding pharmaceuticals.
Learning calculus achieves the same effect, though. It is not the teaching that is important (although some may find it useful).
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It's very short.