How we calculate savings.

The calculation

Both figures are in USD and both describe the same quantity — the same strength, the same pack size, the same presentation. If we cannot match the quantities on both sides, we do not publish a percentage, because a saving calculated across different pack sizes is meaningless.

The rules we apply

• We compare against the lowest realistic US cash price

  Not the manufacturer list price, which almost nobody pays. If a generic version of the same active ingredient is sold in the US, or the manufacturer sells direct to cash-paying patients, we use that lower figure — even when it makes our saving look smaller or disappear entirely.

• We round down, never up

  A calculated 69% is published as 65%. Cash prices move between pharmacies, regions and months, and rounding down keeps the figure on the conservative side of that variation.

• Below 15% we show no percentage at all

  If the honest saving is small, we would rather show you the two prices and let you decide than dress a small difference up as a headline. Some medications on this site show no savings figure for exactly this reason.

• We cap published savings at 80%

  A figure above that is nearly always a unit-matching error on our side rather than a real saving, so we cap it and flag the product for review.

• Every price carries its source and date

  Where we show a US price, we show where it came from and when we last checked it. Prices are re-verified periodically, and an old date means exactly that.

What the number is not

Pricing can change with availability, presentation, quantity, treatment duration, and the outcome of a case review. Some medications cost less in the United States than through us, and where we know that, we say so rather than advertising a saving. Always speak to a licensed healthcare professional about your treatment, and check any manufacturer patient assistance programme you may be eligible for.

Common questions

• Is the savings percentage a quote?

  No. It is a comparison between a published US cash price and the price we list, both in USD. Your actual cost depends on the prescription, the presentation, the quantity, treatment length, and the outcome of a case review. Nothing on this site is a guarantee of savings.

• Why do some medications show no savings percentage?

  Because the honest figure is below 15%, or because a US generic or manufacturer direct-purchase programme costs the same or less than we do. We would rather show nothing than publish a number we cannot stand behind.

• Where do the US prices come from?

  Published US cash prices — pharmacy price guides, manufacturer list and direct-to-patient pricing, and public CMS datasets such as Medicare Part B and Part D spending and NADAC. We do not scrape pricing sites. Each product page names the source used for that product.

• How often are the prices checked?

  US reference prices are re-verified periodically and the date shown on each product page is the date we last checked. Mexico prices are updated with each catalogue import.

• Could I pay less in the US than the price shown here?

  For some medications, yes — particularly where a US generic exists or the manufacturer runs a direct-purchase or patient assistance programme. Where we know that is the case, we do not advertise a saving. We would always encourage you to check manufacturer assistance programmes before deciding.