U.S. National Library of Medicine, MedlinePlus · reviewed 2026-10-10
What this source supports: MedlinePlus publishes consumer drug information pages maintained by the National Library of Medicine.
Source limit: Your prescription label and pharmacist instructions govern your own dosing schedule.
These sources support the statements above. They do not show that every person needs this guide. They do not show a specific result.
Limits
This guide compares the prices you enter. It does not check whether a generic is right for you.
Your prescription label and pharmacist instructions govern your own dosing schedule.
Use current instructions from the responsible organization. This guide is a planning aid, not an official decision or a substitute for qualified advice.
Common questions
What does the App compute?
Turn two prices and a fill count into the per-fill, yearly, and monthly price difference.
What does the App not do?
This App compares the prices you enter. It does not check whether a generic is right for you.
Where do the numbers come from?
You enter every number yourself. The sources support the method and the limits. They do not produce a result for your specific case. Keep the original documents next to the sheet you build.
Before you start
Open the linked source page and keep it beside you.
Gather the values the App asks for:
Brand price per fill in dollars.
Generic price per fill in dollars.
Fills per year.
Set aside ten quiet minutes; rushed numbers are the main error this guide prevents.
Free Companion App
The App computes the worked example with your own numbers, in your browser.
APP 1
Generic versus Brand Price Check
Turn two prices and a fill count into the per-fill, yearly, and monthly price difference.
This guide is edited for clarity and checked against the sources it links. It is not a substitute for official instructions or qualified advice. A linked source does not show that every person needs this guide.