COLYTE-FLAVORED
Clinical safety rating: caution
Comprehensive clinical and safety monograph for COLYTE-FLAVORED (COLYTE-FLAVORED).
Colyte is an osmotic laxative that induces diarrhea by retaining water in the colon through non-absorbable polyethylene glycol (PEG) and electrolytes, resulting in bowel cleansing.
| Metabolism | Polyethylene glycol (PEG) is not significantly metabolized; it is excreted unchanged in feces. |
| Excretion | Primarily eliminated in feces (≥95%) as intact drug via the gastrointestinal tract. Minimal systemic absorption; renal excretion accounts for <1% of the administered dose. |
| Half-life | Not applicable; the drug acts locally in the gastrointestinal tract without significant systemic absorption. For the small fraction absorbed, a terminal elimination half-life of approximately 0.5-1 hour is estimated, but clinical relevance is negligible. |
| Protein binding | Negligible (<5%) due to minimal systemic absorption; no specific binding proteins identified. |
| Volume of Distribution | Not meaningful due to negligible systemic absorption. The small fraction absorbed distributes primarily in extracellular fluid; a theoretical Vd would be low (<0.2 L/kg), but not clinically relevant. |
| Bioavailability | Oral bioavailability is <1% due to minimal gastrointestinal absorption; the drug acts locally within the intestinal lumen. |
| Onset of Action | Oral administration: Onset of bowel cleansing occurs within 30 minutes to 3 hours, typically starting 1 hour after ingestion. |
| Duration of Action | Duration of bowel cleansing effect persists for approximately 4-6 hours following completion of the solution ingestion, corresponding to the time required for intestinal transit and evacuation. |
4 liters orally as a single dose or in divided doses for colonoscopy preparation, or 1 liter orally every 10-15 minutes until 4 liters are consumed.
| Dosage form | FOR SOLUTION |
| Renal impairment | Use with caution in patients with GFR <30 mL/min/1.73 m2; consider alternative bowel preparation. No specific dose adjustment defined. |
| Liver impairment | No specific adjustment for Child-Pugh class A or B; use with caution in severe hepatic impairment (Child-Pugh C) due to risk of fluid and electrolyte disturbances. |
| Pediatric use | Not recommended for use in children; safety and efficacy not established. |
| Geriatric use | Use with caution; monitor for fluid and electrolyte imbalances, renal function, and volume status. Consider lower dose or split-dose regimen. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for COLYTE-FLAVORED (COLYTE-FLAVORED).
| Breastfeeding | Excretion unknown; likely minimal systemic absorption. No M/P ratio available. Use with caution. |
| Teratogenic Risk | Category C: Not associated with major malformations; limited data in pregnancy. No known teratogenicity; use only if clearly needed. |
| Fetal Monitoring | Monitor for electrolyte imbalances, dehydration, and renal function; fetal heart rate monitoring if maternal status unstable. |
■ FDA Black Box Warning
There is no FDA black box warning for Colyte.
| Serious Effects |
["Gastrointestinal obstruction","Gastric retention","Bowel perforation","Toxic colitis","Toxic megacolon","History of severe electrolyte abnormalities","Known hypersensitivity to any component"]
| Precautions | ["Risk of aspiration and esophageal perforation in patients with impaired gag reflex or altered consciousness","Electrolyte disturbances (e.g., hypernatremia, hypokalemia) in patients with renal impairment or dehydration","Cardiac arrhythmias in patients with electrolyte imbalances or QT prolongation","Colonic mucosal erosions or ulcerations with repeated use","Not for use in patients with gastrointestinal obstruction, perforation, or ileus"] |
| Food/Dietary | Only clear liquids are allowed during bowel preparation. Avoid milk, cream, soups with solid ingredients, red or purple liquids, and alcohol. Solid food should be avoided at least 2 hours before starting the solution. No food interactions with the drug itself; dietary restrictions are for the procedure. |
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| Fertility Effects | No known adverse effects on fertility. |
| Clinical Pearls | Colyte-Flavored (PEG-3350 and electrolytes) is a colonic lavage solution used for bowel preparation prior to colonoscopy. Ensure adequate hydration: patients must consume all 4 liters (or split-dose regimen). Concurrent use of other laxatives or enemas is generally not needed. In patients with impaired gag reflex, renal insufficiency, or electrolyte abnormalities, use with caution. Monitor for bloating, nausea, and aspiration risk. Avoid use in GI obstruction, toxic colitis, or megacolon. |
| Patient Advice | Do not add any other ingredients to the solution. · Chill the solution before drinking to improve palatability. · Drink the entire volume over the prescribed period; do not eat solid foods until after the procedure. · Expect frequent, watery bowel movements; stay near a toilet. · Take other medications at least 1 hour before starting the solution, except as directed by your doctor. · Stop drinking the solution 2-3 hours before the procedure. · If severe bloating, abdominal pain, or vomiting occurs, pause and resume later. |