Disodium phosphate draws water into the bowel to produce a cleansing flush. Doctors use it only under supervision, preparing the colon before procedures like colonoscopy. The FDA warns strongly against its use for routine constipation because it can trigger acute phosphate nephropathy, a kidney injury. Many oral sodium phosphate products have been pulled from shelves or restricted. At much lower levels, it also acts as a food emulsifier and pH buffer.
Take only when prescribed by a healthcare provider. Avoid it if you have kidney disease, heart failure, dehydration, or take ACE inhibitors, diuretics, or NSAIDs. Older adults and people with electrolyte imbalances face higher risk. Do not use during pregnancy or breastfeeding unless specifically directed.