Clinical trial explainer videos: what they need to do

A clinical trial explainer video exists to make a trial understandable to people deciding whether to take part in it, or to sites deciding whether to run it. That purpose imposes constraints most medical animation does not have. It is not a marketing asset, and treating it as one causes problems: the material a prospective participant sees sits close to the informed consent process, and anything that oversells benefit or understates burden is a real risk rather than an aesthetic one. The useful mental model is comprehension, not persuasion. A good trial explainer improves how well someone understands what is being asked of them — the schedule, the procedures, the randomisation, the commitment — and is successful if some people decline as a result. Clarity about burden is a feature.

What these usually need to cover

• What the trial is testing, in plain terms
• What participation actually involves — visits, procedures, duration, anything invasive
• Randomisation, which is consistently the least understood concept and the one most worth animating
• What is voluntary, including the right to withdraw
• Who to contact

Randomisation is where animation genuinely outperforms text. “You may receive the investigational treatment or a placebo, assigned by chance” is a sentence most people can read and few can picture. A short visual of allocation does the job in seconds, and it is the concept participants most often misunderstand.

The constraints that make these different

Review is heavier. Trial-facing material typically passes through clinical, regulatory and often an ethics committee or IRB. That is a calendar consideration more than a creative one — plan for it in the schedule rather than discovering it.

Claims are tightly bounded. Anything implying efficacy is a problem in a trial context, because efficacy is precisely what is not yet known. Visual language has to stay descriptive.

Plain language is mandatory, not stylistic. Readability requirements for participant-facing material are usually specified, and narration is part of that.

Translation is common. Multi-site and multi-country trials need versions. Planning for it at storyboard stage — avoiding baked-in on-screen text, leaving room for longer languages — costs nothing then and a re-edit later.

What good looks like

Short, calm, specific, and honest about burden. The test is not whether it makes the trial look appealing; it is whether someone who watched it could accurately describe what they would be signing up for.

If you have a protocol and a site or participant audience in mind, send the outline and we will tell you what is animatable and what is better handled as written material — sometimes most of it is.