So what.
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That is controlled as in controlled by the government. If you sell things the government controls, then you follow the government rules.
There examples you gave like vegan place selling meat. Well meat is not a controlled substance. There are health regulations but the government does not tell them who they can or can not sell to like a pharmacy. It is just hypocritical for a pharmacy to complain about government interference when its whole existence depends on government intervention.
If there were no government at all there would be pharmacies there always have been under different guises. Someone will see a product the people want. The irony here is that the government precludes people from freely buying a product and then sets demands on the sellers that are, in their eyes. immoral. The people you want to control everything from whether you can get drug x to whether you have to sell that drug are the problem.