If you keep a three month supply of your essential Rx medications on hand, you are way ahead of most people, in my experience. One of the more difficult problems in disaster response is often supplying people with needed Rx meds when there are no open pharmacies. Many insurance plans offer mail-order pharmacy services. Usually, they refill a three month supply at a time, as opposed to one month at a time for retail pharmacies, and often are less expensive, as well.