Use As Preparation For Colonoscopy
When Phospho soda is used as preparation for colonoscopy, 1.5 fluid ounces (45ml), mixed with an equal amount of water or any clear liquid and followed by 8 oz of water, is taken, followed by a second dose 6 hours later (3 oz total). It will cause very loose, eventually watery stools, usually starting within an hour or so and lasting several hours.
A 2007 study showed that in patients with decreased renal function, Phospho soda may worsen renal impairment compared to polyethylene glycol-based laxatives. In patients without kidney problems, no difference was observed.
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