April 29, 2017
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Flavor packs are for use only in combination with the contents of the accompanying 1 gallon container. No other additional ingredients (e.g., flavorings) should be added to the solution. Colyte with flavor packs should be used with caution in patients with severe ulcerative colitis.



Patients with impaired gag reflex, unconscious or semiconscious patients and patients prone to regurgitation or aspiration should be observed during the administration of Colyte® with flavor packs, especially if it is administered via nasogastric tube.

Serious Fluid and Serum Chemistry Abnormalities

Advise patients to hydrate adequately before, during, and after the use of Colyte. Use caution in patients with congestive heart failure when replacing fluids. If a patient develops significant vomiting or signs of dehydration including signs of orthostatic hypotension after taking Colyte, consider performing post-colonoscopy lab tests (electrolytes, creatinine, and BUN) and treat accordingly. Fluid and electrolyte disturbances can lead to serious adverse events including cardiac arrhythmias, seizures and renal impairment. Fluid and electrolyte abnormalities should be corrected before treatment with Colyte.

In addition, use caution when prescribing Colyte for patients who have conditions, or who are using medications, that increase the risk for fluid and electrolyte disturbances or may increase the risk of adverse events of seizure, arrhythmia, and renal impairment.

Cardiac Arrhythmias

There have been rare reports of serious arrhythmias associated with the use of ionic osmotic laxative products for bowel preparation. Use caution when prescribing Colyte for patients at increased risk of arrhythmias (e.g., patients with a history of prolonged QT, uncontrolled arrhythmias, recent myocardial infarction, unstable angina, congestive heart failure, or cardiomyopathy). Pre-dose and post-colonoscopy ECGs should be considered in patients at increased risk of serious cardiac arrhythmias.


There have been reports of generalized tonic-clonic seizures and/or loss of consciousness associated with use of bowel preparation products in patients with no prior history of seizures. The seizures cases were associated with electrolyte abnormalities (e.g., hyponatremia, hypokalemia, hypocalcemia, and hypomagnesemia) and low serum osmolality. The neurologic abnormalities resolved with correction of fluid and electrolyte abnormalities.

Use caution with prescribing Colyte for patients with a history of seizures and in patients at increased risk of seizure, such as patients taking medications that lower the seizure threshold (e.g., tricyclic antidepressants), patients withdrawing from alcohol or benzodiazepines, or patients with known or suspected hyponatremia.

Renal Impairment

Use caution when prescribing Colyte for patients with impaired renal function or patients taking concomitant medications that may affect renal function (such as diuretics, angiotensin converting enzyme inhibitors, angiotensin receptor blockers, or non-steroidal anti-inflammatory drugs). Advise these patients of the importance of adequate hydration, and consider performing baseline and post-colonoscopy laboratory tests (electrolytes, creatinine, and BUN) in these patients.

Colonic Mucosal Ulcerations and Ischemic Colitis

Administration of osmotic laxative products may produce colonic mucosal aphthous ulcerations, and there have been reports of more serious cases of ischemic colitis requiring hospitalization. Concurrent use of stimulant laxatives and Colyte may increase the risk. The potential for mucosal ulcerations resulting from the bowel preparation should be considered when interpreting colonoscopy findings in patients with known or suspected inflammatory bowel disease (IBD).

Use in Patients with Significant Gastrointestinal Disease

If gastrointestinal obstruction or perforation is suspected, perform appropriate diagnostic studies to rule out these conditions before administering Colyte. Use caution in patients with severe active ulcerative colitis.


Use with caution in patients with impaired gag reflex and patients prone to regurgitation or aspiration. Such patients should be observed during administration of Colyte, especially if it is administered via nasogastric tube.

Not for Direct Ingestion

The contents of each jug must be diluted with water to final volume of 4 liters (4L) and ingestion of additional water is important to patient tolerance. Direct ingestion of the undissolved powder may increase the risk of nausea, vomiting, dehydration, and electrolyte disturbances.

If gastrointestinal obstruction or perforation is suspected appropriate studies should be performed to rule out these conditions before administration of colyte® with flavor packs.

Information for Patients

(see Medication Guide)

Colyte® with flavor packs produces a watery stool which cleanses the bowel prior to examination.

For best results, no solid food should be ingested during the 3 – 4 hour period prior to the initiation of Colyte with flavor packs administration. In no case should solid foods be eaten within 2 hours of drinking Colyte with flavor packs.

The rate of administration is 240 mL (8 fl. oz.) every 10 minutes. Rapid drinking of each portion is preferred rather than drinking small amounts continuously.

The first bowel movement should occur approximately one hour after the start of Colyte® with flavor packs administration.

Administration of Colyte with flavor packs should be continued until the watery stool is clear and free of solid matter. This normally requires the consumption of approximately 3 - 4 liters (3 - 4 quarts), although more or less may be required in some patients. The unused portion should be discarded.

Consume water or clear liquids during the bowel preparation and after completion of the bowel preparation up until 2 hours before the time of the colonoscopy.

Carcinogenesis, Mutagenesis, Impairment of Fertility

Studies to evaluate carcinogenesis or mutagenic potential or potential to adversely affect male or female fertility have not been performed.

Pregnancy - Category C

Animal reproduction studies have not been conducted with Colyte to evaluate the carcinogenic potential. It is not known whether Colyte can cause fetal harm when administered to a pregnant woman or can affect reproductive capacity. Colyte should be given to a pregnant woman only if clearly needed.

Nursing Mothers

It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when Colyte is administered to a nursing woman.

Pediatric Use

The safety and effectiveness of Colyte in pediatric patients have not been established.

Geriatric Use

Published literature contains isolated reports of serious adverse reactions following the administration of PEG-ELS products in patients over 60 years of age. These adverse events include upper GI bleeding from Mallory-Weiss Tear, esophageal perforation, asystole, sudden dyspnea with pulmonary edema, and “butterfly-like” infiltrate on chest x-ray after vomiting and aspirating PEG.

This monograph has been modified to include the generic and brand name in many instances.

Last reviewed on RxList: 12/12/2016


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