Businesses in pharmaceutical preparations develop, manufacture, formulate or supply medicines intended to prevent, diagnose or treat illness. Products may include prescription-only medicines, pharmacy medicines and some non-prescription remedies, supplied as tablets, capsules, liquids, creams, injections, inhalers or other dosage forms. Some businesses specialise in particular areas, such as generic medicines, sterile products, vaccines or active pharmaceutical ingredients, while others provide contract manufacturing, packaging or formulation services for medicine developers. The work can involve selecting ingredients, producing consistent batches, testing quality and stability, and preparing products for storage and distribution. Medicines placed on the UK market are subject to regulatory controls, including authorisation requirements and standards for manufacturing quality overseen by the Medicines and Healthcare products Regulatory Agency (MHRA).