> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/domain-specific-modeling/pharmaceutical-and-biologic-product/pharmaceutical-and-biologic-product-and-dose-form-attributes-summary/appendix-a-product-patterns/continuous-presentation-metered-dose-unit-of-presentation.md).

# Continuous presentation: Metered dose unit of presentation

<mark style="color:$danger;">**This Editorial Guide is used for Education Purposes Only. It is used in the Authoring Courses and Certifications. It is based on the January 2026 Editorial Guide.**</mark>

*Examples: various inhalers, nasal sprays, some cutaneous sprays/foams*

The unit of presentation is the actuation, the “single operation of a metered-dose pump, valve or other equivalent dosing mechanism” \[EDQM].

Strength is expressed as “per one unit of presentation” and the presentation strength and the concentration are exactly the same.

### Example: Single inhaler containing a total of 200 actuations worth of salbutamol, 100 micrograms per actuation, packaged in a box

<figure><img src="/files/Hb0dVcrVN0lYs83Uxz7t" alt=""><figcaption></figcaption></figure>

<figure><img src="https://github.com/SNOMED-Documents/snomed-editorial-guide/blob/main/authoring/pharmaceutical-and-biologic-product/images/304775951.jpg" alt=""><figcaption></figcaption></figure>

| Manufactured dose form          | Solution for aerosolisation        |                                                                                                                                                                                     |
| ------------------------------- | ---------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Unit of presentation            | Actuation                          |                                                                                                                                                                                     |
| \[Pack size]                    | 200 actuations in the inhaler      |                                                                                                                                                                                     |
| Precise active ingredient       | salbutamol sulphate                |                                                                                                                                                                                     |
| Basis of strength substance     | salbutamol                         |                                                                                                                                                                                     |
| Presentation strength (logical) | 100 mcg per 1 unit of presentation |                                                                                                                                                                                     |
| Presentation strength           | 100 mcg per 1 actuation            | UCUM: 100 mcg per 1 each                                                                                                                                                            |
| Concentration strength          |                                    | The concentration of salbutamol sulphate in the inhalant solution inside the inhaler container is probably known to the regulatory agency but is not deemed clinically significant. |

<a href="https://docs.google.com/forms/d/e/1FAIpQLScTmbZIf0UEQwYDkY27EEWBkaiYkHSbR0_9DmFrMLXoQLyL7Q/viewform?usp=pp_url&#x26;entry.1767247133=SCT+Editorial+Guide&#x26;entry.670899847=Continuous%20presentation%3A%20Metered%20dose%20unit%20of%20presentation" class="button primary">Provide Feedback</a>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/domain-specific-modeling/pharmaceutical-and-biologic-product/pharmaceutical-and-biologic-product-and-dose-form-attributes-summary/appendix-a-product-patterns/continuous-presentation-metered-dose-unit-of-presentation.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.