In line with Directive 2011/24/EU on the application of patients' rights in cross-border healthcare (hereafter: the Directive) and complementary to the "Guiding Principles and Indicators for the practice of National Contact Points (NCPs) under the Cross-border Healthcare Directive 2011/24/EU", these Guiding Principles provide recommendations to improve information provided to citizens on prior authorisation systems under the Directive. The purpose of these Guiding Principles is to set out key principles to help NCPs provide more transparent, accessible and understandable patient-oriented information on prior authorisation. The Guiding Principles cover the following main areas: 1. Transparency of prior authorisation systems; 2. Clarity and consistency of prior authorisation procedures; 3. Understandable information on prior authorisation.