The British Pharmacopoeia is the national pharmacopoeia of the UK and is published annually. It contains quality standards for UK medicinal substances and includes monographs on ingredients, preparations, packaging and other requirements. It has multiple volumes covering medicinal substances, formulated preparations, appendices and indices. The appendices provide information on interactions, borderline substances, cautionary labels and wound management products. It is used by healthcare professionals in the UK as an official reference for pharmaceutical substances and preparations.