Force? The store does not sell the pills. It's not the pharmacists job to shop for the customer. There was no life/death situation here for the customer. The customer was free to go elsewhere, or did the pharmacist tie the woman up to the security bar at Target's front door to keep her there until the pill would no longer work?
My father was a pharmacist. He was also a small business owner. He had every right to stock whatever medicines he wanted. And if a customer did not like his service or the service of his employees, they could go elsewhere. No big deal. I doubt Target would lose a lot of customers over this one pharmacist refusing to sell a rarely requested pill.
And if your father's employees refused to sell his store's products, he could fire them.
Correct?
The pharmacist's job is whatever the employer says it is, so long as it's not illegal.