Using the app

The app is in Spanish. Open it at mrueda.github.io/nomenclator-delta/app/. At the top of the page, you can see which two months are being compared and how many presentations are in the later file.

Use Periodo comparado to choose a comparison. The dropdown lists the newest period first, selected by default and marked Último disponible. Below it, the app shows the latest publication available in its dataset, the selected period's counts, and any missing-month warning. The latest available publication does not imply that a newer Ministry release has already been collected.

The app normally compares consecutive monthly releases. October 2026 is the one-time exception: September is compared directly with November. A short warning identifies the gap; Más información explains why these accumulated differences cannot be assigned to either month individually.

To get back to the starting screen, select Restablecer. This returns to the latest comparison and clears the search, filters, Cambios/Altas/Bajas view, selected presentation, and shared link.

Search for a presentation

Use the field labelled Código Nacional, medicamento, principio activo o laboratorio. Capital letters and accents do not affect the search. If you enter several words, every word must occur somewhere in the presentation's indexed information.

Useful searches include:

• a six-digit Código Nacional, such as 700579;
• any distinctive part of the official product name;
• one or more active ingredients;
• the offering laboratory name.

The default Cambios view shows only presentations with a change in the selected period. The compared months also appear above the results. The app initially shows up to 100 matches; Mostrar más reveals the next 100 until all matches are visible. Changing the search, filter, view, or period resets the list to the first 100. Selecting a presentation keeps the expanded list.

Refine the results

The top navigation changes the result set:

• Cambios shows every presentation with one or more changes;
• Altas shows a Código Nacional that is absent from the earlier file and present in the later file;
• Bajas shows a Código Nacional that is present in the earlier file and absent from the later file.

Use Tipo de cambio to select one kind of change, such as Cambio de precio or Cambio de estado.

Download the filtered results

Select Descargar CSV to download all matching presentations, including those beyond the first 100 shown on screen. The file follows the current search, view, and change-type filter; the button is disabled when there are no matches.

The UTF-8, semicolon-separated file contains one row per presentation, with Código Nacional, name and laboratory from the latest search index, the two compared months, change labels, and any missing-month warning. It is a summary, not a full export of before-and-after values. Names and laboratories may be newer than a historical comparison; use the detail panel to inspect historical values.

Inspect the timeline

Select a result to open its details. The panel shows:

1. the Código Nacional and whether it occurs in the later file;
2. the latest available product state;
3. one before-and-after card for every changed field;
4. the period in which each change occurred;
5. source details for both monthly files.

Prices are displayed in euros with Spanish decimal formatting. Blank official values appear as Sin dato. A link with #cn=NNNNNN opens the same changed presentation directly and can be shared.

Check the source

The Procedencia section lists when each file was retrieved and part of its SHA-256 checksum. Use its Ministerio de Sanidad link to check the current official information before making an operational decision. The Ministry may have published a newer release since this site was updated.

The Comparación disponible line tells you exactly which months this site contains. Automatic checks on the 1st, 5th, and 10th look for a new Ministry release. A release appears only after collection and validation succeed.

Next: Interpreting changes.