Run-in period
A short trial period before the study proper begins.
Learning
What it means
A run-in period happens after enrolment but before the main study starts. Everyone may receive the same thing — sometimes a placebo — while the team checks that participants can follow the schedule.
Why it matters if you take part
It means the study may not begin in earnest on your first visit, and some people do not continue past this stage.
Related terms
This explains how clinical research works. It is not medical advice and does not describe any specific condition or treatment. Only a trial site can determine whether someone can take part in a study.