The Food and Drug Administration hopes hospitals and clinics will vote with their pocketbooks, buying supplies from pharmacies regulated under new powers just given to the agency. Congress passed a law last month giving the FDA authority to regulate some so-called compounding pharmacies. The aim is to have some oversight over operations that are far bigger than the small pharmacies that make medicines to order. FDA demanded the changes after a fungal meningitis outbreak last year that killed 64 people and sickened more than 750 others across the country. The outbreak was traced to contaminated drugs sold by a single pharmacy – the New England Compounding Center in Massachusetts.