A Complete Guide to ISO 26825:2020 for Medical Labels

In critical care environments like operating theatres, clarity, speed, and accuracy are essential. Even small labelling errors can lead to serious medication incidents. That’s why ISO 26825:2020 exists—to standardise how syringe labels are designed, applied, and used during anaesthesia.

This updated version builds on the earlier 2008 standard, introducing refinements that improve usability, durability, and patient safety.

What ISO 26825:2020 Covers

ISO 26825:2020 sets out requirements for user-applied labels on syringes used during anaesthesia. Its goal is to ensure that medications can be clearly identified immediately before use.

The standard focuses on:

• Colour coding by drug class

• Label size and layout

• Typography and readability

• Material performance and durability

Importantly, the standard reinforces that:

Colour is only an aid—clinicians must always read the label before administering a drug.

Why This Standard Matters

Anaesthetic drugs are often:

• Colourless liquids

• Stored in similar syringes

• Prepared quickly under pressure

ISO 26825:2020 reduces risk by creating a consistent visual language across healthcare environments. This helps clinicians:

• Identify drug classes instantly

• Reduce cognitive load

• Minimise medication errors

Colour Coding System (Drug Classes)

At the heart of the standard is a strict colour-coding system applied to label backgrounds.

Key Examples

• Induction agents → Yellow

• Opioids → Blue

• Muscle relaxants → Red

• Local anaesthetics → Grey

• Benzodiazepines → Orange (with white text)

• Anticholinergics → Green

• Vasopressors → Violet

• Antiemetics → Salmon

Special Cases

• Antagonists (opposite-action drugs) use diagonal white stripes over the base colour

• Muscle relaxant reversal drugs include striping + a black divider line

• Heparin → White with black border

• Suxamethonium & Adrenaline → Black bar with white text for high visibility

This structured approach ensures immediate recognition, even in high-stress situations.

Label Design & Layout Requirements

ISO 26825:2020 goes beyond colour—it defines exact layout rules.

Size Specifications

• Length: 25–40 mm

• Width: 10–15 mm

This ensures labels fit syringes without covering measurement markings.

Drug Name Presentation

• Must be clear and prominent

• Positioned in the upper half of the label

• Minimum text height: 2.5 mm

• Use sans-serif fonts (bold or semi-bold)

• Avoid ALL CAPS—use:

  • Sentence case, or

  • “Tall Man” lettering (e.g. hydrOXYzine vs hydrALAZINE)

Colour & Text Rules

• Typically black text on coloured background

• Exceptions:

  • Some drugs require white text for contrast (e.g. benzodiazepines)

• High contrast is essential for readability under clinical lighting

Concentration Information

• Usually placed in the lower half of the label

• Units (e.g. mg/mL) should be pre-printed where possible

• Space must remain for clinicians to add information manually

Material & Performance Requirements

ISO 26825:2020 introduces strict performance criteria to ensure labels remain functional in real-world conditions.

Adhesive Strength

Labels must:

• Stick securely to syringes

• Withstand exposure to 50% isopropanol solution

• Not peel, curl, or move after drying

This reflects real hospital environments where disinfection is routine.

Writeability

• Labels must allow writing with a ballpoint pen

• Ink must not smudge or blur

Format & Packaging

• Labels may be supplied in tape form

• Must be easy to separate and apply

• Packaging should clearly reference ISO 26825:2020 compliance

Advanced Design Features

Diagonal Striping for Safety

Antagonist drugs use:

• 1 mm diagonal stripes

• Set at a 45° angle

• Applied without obstructing the drug name

This adds a secondary visual cue for critical drug distinctions.

Ready-Mixed Drugs

For combination drugs:

• Either two labels can be used, or

• A single label reflecting the intended action

Example:A reversal combination should be labelled as a muscle relaxant reversal, even if multiple drugs are present.

Regional Flexibility

The standard allows adaptation for:

• Non-Roman alphabets

• Local pharmacopoeia naming conventions

However, the principles of clarity and legibility must always be maintained.

What’s New in the 2020 Update?

Compared to the 2008 version, ISO 26825:2020 includes:

• Updated colour definitions and classifications

• Improved guidance on drug name presentation

• New rules for diagonal stripe sizing

• Better handling of ready-mixed drugs

• Removal of outdated elements (e.g. fluorescent red)

These changes reflect evolving best practices in patient safety and human factors design.

Key Takeaways for Medical Label Buyers

If you’re sourcing or manufacturing medical labels, ISO 26825:2020 means your labels should:

• Follow strict colour-coding by drug class

• Use clear, legible typography

• Be durable in clinical conditions

• Allow for manual annotation

• Include structured layout and spacing

Final Thoughts

ISO 26825:2020 is more than a design guideline—it’s a critical safety framework. By standardising colour, layout, and usability, it helps reduce medication errors in one of the most demanding areas of healthcare.

For hospitals, pharmacies, and medical suppliers, adopting ISO-compliant labels is a direct investment in:

• Patient safety

• Clinical efficiency

• Regulatory alignment