One thing is that some family members are on medical regimes that require daily pills they only dish out a month ahead and are prescription only.
Couple of tips with this:
1) If you haven't already, get prepayment cards. All decent pharmacies sell them. I have a 3-month one, costs £29 and all prescriptions during that three months are paid for.
2) Ask for a repeat before you've quite run out of pills. After a few months, you'll have built up a stock of spare.
3) Ask your doctor for a 'spare' scrip for winter, so you can specifically have some in stock in case you are cut off. It's no different to, say, someone going on a long holiday or business trip abroad, they'd have to take extra medication with them.