Another option is to have your doctor alter the prescription by upping the dosage. That's what my doctor has done. If yours upped your dosage from one a day to two a day, then voila, instant additional 30 day supply. He can change it back after that.

It also helps if you have a good relationship with your doctor. Mine has been a good friend for the past 20 years or so, so he has no qualms about doing this for me. On the other hand, my medication is not a controlled substance either so that may make a difference as well.

The current epidemic of prescription drug addiction (at least in our area) is making most doctors much more careful about how they prescribe some medications (Izzy, unfortunately our area is a pretty likely destination for some of those drugs from FL). Keep that in mind if he/she seems uncooperative at first. Be up front and honest with why you want the additional medicine (no reason not to be) and they will likely be more comfortable doing so. Simply asking, "Doc, I'd like to have an extra 30 days of medication on hand in case of [insert catastrophe hear], what do you think would be the best way to do that?" Put the ball in their court and let them come up with a solution they are comfortable with.