What is ADR?

ADR definition and meaning on Health terms:
A response to a medicinal product which is harmful and unintended. Response in this context means that a causal relationship between the medicinal product and an adverse event is at least a reasonable possibility.  Adapted from the Guideline on good pharmacovigilance practices (GVP) Annex I – Definitions (Rev 3) 2014. http://www. ema. europa. eu/docs/en_GB/document_library/Scientific_guideline/2013/05/WC500143294. pdf