Continuous presentation: Metered dose unit of presentation

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.

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

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.

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