As mentioned before, drugs are perishable products even though the expiry date is long. Inventory management of those is difficult and pharmacies know how many types of medicines (and units) they can sell and adjust their orders. However, a prescription drug is different. Doctors prescribed it to patients and pharmacies sell according to this. Different manufacturers create the same core ingredient in those drugs, leading to a competition influenced by lobbying. Some doctors keep on changing prescriptions, forcing pharmacies to save several companies’ prescription drugs with the same effect and this is the same problem regarding hospitals, which can also recommend other ones. Some medicine are finally used only once, expire and are returned
