When I get a script from my MD, if it is something that I need a stockpile of, then I ask him to write double the dose. Instead of a 30 day supply, I now have a 60 day supply.

I mostly do this with broad spectrum anti-biotics. This leaves me with a extra dosage series (usually 7-10 days) which I carry with me onboard ship. If I have a bacterial infection while I am on the boat, I can take the dosage series, as prescribed, versus having to get off the boat, go to a Dr, get the same anti-biotics, then wait (lose work) for the anti-biotics to do their thing, killing the little bugs, before I can get a Dr's release to go back to work.

Where I am required to take a pill/capsule each 12 hours, my MD writes out 2 pills/capsules each 12 hours. This makes my insurance company happy and allows me to keep those prescription drugs on hand, in sufficient numbers, to handle most emergencies.

The same thing is true of an emergency at home, where the Dr's offices and/or pharmacies are closed.