I don’t get it. Increasing the number of repeats (as mentioned in the opening paragraph) makes the ratio
visits-to-pharmacy/visits-to-doctor
go up, and would in general be seen as a good thing by customers and pharmacies alike (and of course as a bad thing by doctors).
For the quantity in one supply, the pharmacy perspective is likely to be negative i.e. the opposite. As always, the devil is in the details
For selected patients, it could be a good thing to have each supply be for a larger quantity. For other patients, it could be a bad thing e.g. results in medicine being thrown out (waste of taxpayer funds, waste of resources), or given away to a friend, or sold dubiously, or, tying in with the topic on paracetamol, used for an overdose.
So it’s going to come down to what “selected drugs” and “selected patients” means in practice. In general, it could be seen as a good thing for customers i.e. less hassle - fewer visits to both doctor and pharmacy.
This already exists within the regulations covering prescriptions i.e. a doctor can write a prescription with multiple repeats but get the pharmacist to dispense the whole lot in one go - which has the effect of increasing the number of days supply that a customer could hold. (I forget the section number that applies to this.)
As for supply issues, not a total fiction e.g. for how weird distortions can cause actual shortages: Ozempic helps people lose weight. But who should be able to use it? - ABC News
It isn’t necessarily about “supply line problems”. They also have to consider the cost of inventory, default reorder size, and shelf life. To me that suggests that “selected drugs” should be chosen carefully - to cover a very small number of reasonably popular drugs that have an appropriate shelf life - with the goal of flushing out problems before deploying more widely.