You should be able to enter the patient's name, the drug, and the doctor's prescription along with it.
The salesperson should be able to check the price printed on the medicine and select the same price from the price list on the sales and return screen.
Can I Keep Track of Batches and Expiry of Medicines?
Can I make a Purchase order According to Sales & Inventory Levels of Medicines?
It should provide consolidated information of all outlets at the head office