Cathartic cleansing of the colon is based on the combination of magnesium citrate and bisacodyl tablets (Loso Prep®, E-Z-EM). At 6 p.m. the patients have to ingest the magnesium citrate: 16.5 g (=single dose) dissolved in one glass of cold water. At 7 p.m. they have to take four 5-mg tablets of bisacodyl. When used at this reduced dose, magnesium citrate is a milder cathartic when compared to sodium phosphate and polyethylene glycol (Vanner et al. 1990; Kolts et al. 1993; MacLeod et al. 1998; TayloR et al. 2003b). Furthermore the magnesium citrate is dissolved in only one glass of water. Reducing the volume to drink also improves patient compliance. Magnesium citrate can be used in case of renal insufficiency, heart failure and electrolyte abnormalities which are contraindications for the use of oral sodium phosphate (Macari et al. 2001b; Toledo and DiPalma 2001).
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