What is an Investigational Medicinal Product?

A pharmaceutical form of an active substance or placebo being tested, or used, as a reference in a clinical trial, including products already with a marketing authorisation but, for the purposes of the trial, used or assembled (formulated or packaged) in a way different from the authorised form, or when used for an unauthorised indication, or when used to gain further information about the authorised form (SI 2004/1031).