Prescription Refill Calculator

This calculator turns the quantity on a prescription label into a days supply and a set of dates. Enter how much was dispensed, how much is taken each time, how many doses a day and the date it was filled, and it returns the last day covered, the first day without, and the earliest date a refill is normally released under a 75, 80, 90 or run-out-date rule. A second mode goes the other way and works out the quantity a given number of days needs, with package counts. It is arithmetic on the numbers you enter and nothing more: it does not advise on doses, and a question about a supply running short belongs with the pharmacy or the prescriber.