The risk-benefit profile of vigabatrin as an add-on treatment in adult patients with therapy resistant partial epilepsy with or without secondary generalization in cases where all other appropriate drug combinations have proved inadequate or have not been tolerated may only be considered positive if the Summaries of Product Characteristics are amended as required and the MAHs commit themselves to fulfil the requirements of the CPMP with regard to preclinical and clinical studies and follow-up measures.