What a chain needs that a single pharmacy does not
A chain competes on coverage: whatever the customer needs, one of your branches has it. That advantage disappears if the site shows a single catalogue with no branch information, because the answer becomes "not here, try another" and the customer goes to a competitor instead. Assortment differs between branches and changes weekly, so maintaining it by hand is impossible. Delivery adds a further question nobody answers: which branch it comes from and when.
What we build for a chain
First, one catalogue with live stock at every branch, with the nearest suggested automatically, which is the chain advantage made visible. Second, reservation at a chosen pharmacy held until a stated hour, notifying that branch. Third, delivery routed from the nearest stock, with zones calculated from the customer address. Fourth, automatic exchange with your accounting system across all points, plus a real page per branch, which is what wins local search district by district.