Oral sodium phosphate products (OSP) are used for bowel cleansing prior to colonoscopy or other medical procedures.
Adverse reactions or quality problems experienced with the use of these products may be reported to the FDA's MedWatch Adverse Event Reporting program either online, by regular mail or by fax, using the contact information at the bottom of this page.
- Drug Safety Communication: FDA warns of possible harm from exceeding recommended dose of over-the-counter sodium phosphate products to treat constipation
Information for Healthcare Professionals: Oral Sodium Phosphate (OSP) Products for Bowel Cleansing (marketed as Visicol and OsmoPrep, and oral sodium phosphate products available without a prescription)[ARCHIVED]
Oral Sodium Phosphate (OSP) Actions Questions and Answers[ARCHIVED] Oral Sodium Phosphate (OSP) Products R.E.M.S.(PDF - 84KB)
Letter and REMS information (12/11/2008)
Citizen Petition-Natasha Leskovsek, September 2007 (Docket No. FDA-2007-P-0345)(PDF - 150KB) Citizen Petition-C.B. Fleet, Inc., June 2003 (Docket No. FDA-1978-N-0021)(PDF - 106KB) Historical Information on Oral Sodium Phosphate (OSP) Products for Bowel Cleansing[ARCHIVED]