I have a six month prescription and using DPS scheme for years. Last month chemist was out of stock for one item, and I managed to cope with using half a dose of same item, usually when the item comes in a week or two late they will give me the missing item, but this is month two and it's still not in stock yet, so I asked the chemist that hopefully when it comes in stock that they will give me the extra one they were short but they said no , this item has been out of stock before and I want to have it in case of future problems.(it's a sinnus spray).