December marks year anniversary of FDA OSP black box warning
One year ago this month, the Food and Drug Administration (FDA) issued a black box warning on a common type of laxative known as oral sodium phosphate, or OSP, available both over-the-counter and by prescription. After years of investigation, the FDA finally alerted health care providers and the public of the risk of a serious kidney injury known as acute phosphate nephropathy associated with the use of OSPs.