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When to Start HalfLytely?

If your healthcare provider prescribes HalfLytely® and Bisacodyl (polyethylene glycol electrolyte solution and bisacodyl) before a colonoscopy, it is important to know how and when to use this laxative. You should start HalfLytely and Bisacodyl the day before your procedure. This medication comes with one bisacodyl tablet and HalfLytely powder (to be dissolved in water before use). Normally, the bisacodyl tablet is taken first, and the HalfLytely solution is started after the first bowel movement, or six hours later (whichever comes first).
 
HalfLytely is an osmotic laxative, which works by drawing water into the colon, softening the stool, and causing watery bowel movements. Bisacodyl is a stimulant laxative, which stimulates the smooth muscle of the intestines, causing the muscle to contract more often and produce frequent bowel movements.
 
It is necessary for the bowels to be completely empty before the colonoscopy so that your healthcare provider can look for causes of unexplained changes in bowel habits. Any stool inside the colon may hide important findings.
 
(For more information on when to start this laxative, click HalfLytely and Bisacodyl Uses. This Web article also offers details on what to expect with a colonoscopy.)
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