Colonoscopy prep important, but beware of OSP solutions

October 1st, 2009 by Jennifer Walker-Journey

osmoprep prod 150x150 Colonoscopy prep important, but beware of OSP solutionsMost people dread colonoscopies. Not only does the procedure, which involves a physician running a flexible tube through your colon and intestines, sound uncomfortable, the prep can be a real pain in the you-know-what. This is one reason why, when your doctor orders a colonoscopy, you’ll want to be sure you cleanse your bowel thoroughly and effectively to ensure that your doctor has a clear view of your colon. If not, you may have to repeat the procedure and the prep along with it.

Colonoscopies can be lifesavers, identifying colon and rectum polyps even before they become cancerous. Doctors recommend patients begin regular colon screenings at age 50, or earlier if they have a family history of or symptoms suggestive of colorectal cancer, such as blood in the stool.

Somewhere between age 75 and 85, your doctor may discuss ceasing your regular colonoscopy screenings. This is because the risk of complications increases among older patients. Serious complications are rare, but include perforations during the exam and adverse reactions to the laxatives used to cleanse the bowel prior to colonoscopy.

Earlier this year the Food and Drug Administration (FDA) issued a black box warning on some products used to prep the bowel prior to procedures such as colonoscopies. Those products, called oral sodium phosphates, or OSPs, were available both as a pill prescribed by doctors and solutions available over-the-counter, such as those made by Fleet.

While the FDA deemed that the over-the-counter products were safe when used in lower doses as a laxative, when used in higher doses to cleanse the bowel many patients began to suffer from serious kidney injuries. The kidney injuries often occurred within a day or two, but sometimes as much as weeks or months later. One diagnosis specifically for patients who suffered ill effects from OSPs is acute phosphate nephropathy.

While the reaction most often occurs in older patients, younger ones are not immune. As a result of the black box warning on prescription OSPs and , withdrew its over-the-counter solutions from the market.

Since then, numerous lawsuits have been filed against the makers of products for not fully warning about the risk of serious kidney injury. “In some cases, these serious adverse events occurred in patients with no pre-existing health factors that would have put them at risk for developing kidney injury,” says Janet Woodcock, director of the FDA’s Center for Drug Evaluation and Research.

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