Wait until youse dumb ugly blokes is old and on lotsa medication.
The meds vary in number from 28 to 30 tablets in a pack.
This means you must get more scrips according to the meds in the 28 pack.
You don't want to do a zillion trips to the chemist and Dr so all your meds are based on 28 days.
You end up with extra meds that are in 30 packs.
It starts to get confusing so in the end you get the chemist to make up blister packs for you which means you are officially a dumb old fart and you skulk out of the chemist shop like a dirty old man leaving a sex shop!