"if your selected pharmacy is closed for any reason then"
Here you can go to *any* pharmacy. As soon as the prescription is marked as "done" it can't be used anymore, of course. I usually use three different pharmacies, two nearby home, one nearby work. But sometimes I used others as well. The card is also used to compute tax deductions for drugs and visits.
You can avoid the card and have a simple prescription, but then you have to pay the full price of drugs, because the health service won't pay for them (wholly or partially).