The biggest loss in a pharmacy does not happen in a single day; it builds over months. A product people ask for runs out unnoticed, while another sits on the shelf until it expires. Neither shows up on the daily till roll, but both show up at the end of the year.
A good system solves that with two simple things: live stock for every item, and a warning before expiry rather than after. When a level drops, a restock order is prepared. When a date approaches, the item appears on a list you can discount or return to the supplier.
The second part is the till. When dispensing, invoicing and stock are one system, the daily close takes a minute instead of an hour, and a gap between cash and sales appears the same day rather than a week later.
Then come the numbers that change decisions: which items genuinely earn, which hours sell most, and which branch needs more supply. Those change what you buy and how you price, and let the same sales produce more profit.