Usability Risks When Switching Between Generic and Brand-Name GLP-1 Injection Pens | Research

The takeaway

Comparative study identifies usability risks and design differences between a proposed generic GLP-1 pen injector and the reference brand device.

Usability risks identified
Generic GLP-1 pen design differences from reference device may require additional patient training

What the researchers found

Comparative evaluation identified design differences and usability risks between a proposed generic GLP-1 pen injector and the reference listed drug device that could affect safe substitution.

Why it matters

Millions of patients may switch between GLP-1 pen devices as generics enter the market. Design differences that cause dosing errors could have serious consequences.

How the study worked

Preliminary comparative usability study of a generic vs reference GLP-1 pen injector device for ANDA submission evaluation.

What this study cannot tell us

Preliminary study — full-scale human factors validation needed. May not capture all real-world use errors.

How to read the evidence

Preliminary device usability study — provides initial safety assessment for regulatory consideration.

When this study was published

Published in 2026; relevant as GLP-1 drugs approach generic availability.

The bigger picture

Device usability is often overlooked in generic drug approvals. As complex combination products like pen injectors become generic, ensuring patient safety during switches is critical.

Questions still open

Should patients receive training when switching between GLP-1 pen brands?
Do device design differences affect medication adherence?

Common questions

Are generic GLP-1 pens the same as brand name?

The medication may be equivalent, but the pen device can have different designs, buttons, and dose-setting mechanisms. These differences could lead to errors if patients are not properly trained on the new device.

Should I worry about switching GLP-1 pen brands?

Ask your pharmacist or doctor for instruction if your GLP-1 pen device changes. While medications may be equivalent, device differences can affect how you set doses and inject.

Read the original research

Design Differences and Usability Risks in GLP-1 Pen Injectors: A Comparative Study of a Generic and Reference Device.

PDA journal of pharmaceutical science and technology

View on PubMed ↗Publisher’s paper ↗

Citation

Brunet-Manquat, Laurie; Combedazou, Anne; Ramus, Claire; Frolet, Cécile. (2026). Design Differences and Usability Risks in GLP-1 Pen Injectors: A Comparative Study of a Generic and Reference Device.. PDA journal of pharmaceutical science and technology. https://doi.org/10.5731/pdajpst.2025-000043.1