Hyperosmotic Laxatives
Drug class: Antineoplastic Agents
Usage of Hyperosmotic Laxatives
Constipation
Glycerin (rectally), sorbitol (rectally), and polyethylene glycol (PEG) 3350 (MiraLAX; orally) may be used for relief of occasional constipation. However, rectal suppositories or enemas should not be used when oral laxatives are effective.
Glycerin and sorbitol may be used to treat constipation occurring during pregnancy or the puerperium; however, Bulk-Forming Laxatives or stool softeners are usually preferred.
May avoid or relieve constipation with proper diet (high fiber content [e.g., bran]), adequate fluid intake, prompt response to the defecation reflex, and exercise.
Avoid use of laxatives in infants and children; treat childhood constipation by counseling parents regarding acceptable variations in the frequency of bowel movements.
Bowel Cleansing
PEG 3350 electrolyte solutions are used to empty the bowel prior to colonoscopy and barium enema radiologic examinations. Glycerin and sorbitol also have been used prior to these procedures, but these laxatives do not always entirely empty the colon.
The American Society of Colon and Rectal Surgeons (ASCRS), American Society for Gastrointestinal Endoscopy (ASGE), and Society of American Gastrointestinal and Endoscopic Surgeons (SAGES) recommend the use of PEG 3350 electrolyte solutions in patients with electrolyte or fluid imbalances (e.g., those with renal or liver insufficiency, CHF, liver failure, advanced liver disease with ascites). These experts also recommend use of PEG 3350 electrolyte solutions for colonic cleansing in infants and children.
Sorbitol as an Adjunct to Sodium Polystyrene Sulfonate
Sorbitol is used orally or rectally to facilitate the passage of sodium polystyrene sulfonate (a resin) through the intestinal tract, prevent constipation caused by the resin, aid in potassium removal, and improve the palatability of the resin.
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How to use Hyperosmotic Laxatives
General
Administration
Administer sorbitol rectally; may administer orally when used as an adjunct to sodium polystyrene sulfonate.
Administer glycerin solution and suppositories rectally.
Administer PEG 3350 electrolyte solutions orally or through a nasogastric tube.
Oral or Nasogastric Administration (PEG 3350, PEG 3350 with Electrolytes)
ReconstitutionWhen used for constipation, reconstitute PEG 3350 powder for oral solution (MiraLAX) with 120–240 mL of water (cold, room temperature, or hot).
When used for bowel cleansing, reconstitute PEG 3350 powder (with electrolytes) for oral or nasogastric solution with the appropriate amount of lukewarm water as directed by the manufacturer.
Shake solution vigorously until ingredients are dissolved; additional ingredients (flavorings other than those provided by the manufacturers) not recommended.
Refrigerate the reconstituted solution. Palatability of oral solution may be increased if the reconstituted solution is chilled prior to administration; however, a chilled PEG 3350 electrolyte solution is not recommended for infants.
Administration of PEG 3350 Electrolyte Solution for Bowel CleansingFast for approximately 3 or 4 hours before administration of PEG 3350 electrolyte solution. Do not eat solid foods for at least 2 hours prior to administration.
Administer PEG 3350 electrolyte solutions orally, but may give through a nasogastric tube if patients are unwilling or unable to drink the solution.
Rapid drinking of each PEG 3350 electrolyte solution portion preferred to drinking small amounts continuously.
PEG 3350 electrolyte solutions may be given by single-dose regimens (usually on the evening prior to the colonoscopy [e.g., 6 p.m.] or if procedure is scheduled for midmorning or later allowing patients 3 hours for drinking and 1 hour for complete bowel evacuation) or by divided-dose regimen (usually consuming a portion on the evening prior to the colonoscopy and the remaining solution on the morning of the colonoscopy).
Clinical studies suggest that the divided-dose PEG 3350 electrolyte solution regimen (e.g., 2–3 L the evening before and 1 L the morning of the procedure) is superior to the standard single-dose regimen (e.g., 4 L administered on the evening prior to the procedure).
In one study, PEG 3350 electrolyte solution consumption <5 hours before colonoscopy was superior to a regimen administered ≥19 hours before the procedure. If a patient has an afternoon colonoscopy, administer a portion of the PEG 3350 solution on the morning of the colonoscopy to improve bowel cleansing results.
Administration Precautions (PEG 3350 Electrolyte Solution)Use PEG 3350 electrolyte solutions with caution in patients with impaired gag reflex, unconscious or semiconscious patients, and those prone to regurgitation or aspiration; observe these patients during administration, especially if solution is administered through a nasogastric tube.
If severe discomfort or distention occurs while consuming PEG 3350 electrolyte solutions, slow or temporarily discontinue administration until symptoms abate.
Rectal Administration (Glycerin)
Moisten regular glycerin suppositories with lukewarm water prior to insertion. With steady pressure, gently insert suppository tip high into rectum. Instruct patient to retain the suppository for 15 minutes; not required to melt to produce laxative action. Discontinue use if resistance is encountered.
Before administering glycerin laxative enemas, have patient initially lie on left side with right knee bent and arms resting comfortably or kneel on the bed with the head and chest lowered and forward until the left side of the face is resting on the surface of the bed. With steady pressure, insert enema nozzle into rectum with side-to-side movement with tip pointing toward navel until the entire dose is expelled. While squeezing the container, remove tip from rectum and discard unit. Discontinue use if resistance is encountered. Enema fluids, if properly introduced, usually provide adequate evacuation if retained until definite lower abdominal cramping is felt.
Dosage
Administer laxatives at infrequent intervals in single doses at the lowest effective dosage level, and usually for periods not exceeding 1 week; use for longer periods only under the management of a clinician and as part of a carefully planned therapeutic regimen.
Only extremely high oral doses of sorbitol (25 g daily) or glycerin exert laxative action.
Pediatric Patients
Constipation Glycerin RectalChildren 2 to <6 years of age: 1–1.2 g as a suppository or 2.3 g (2.3 mL) as an enema.
Children ≥6 years of age: 2–2.1 g as a suppository or 5.6 g (5.5 mL) as an enema.
If a bowel movement does not occur after using the glycerin suppository or enema, discontinue drug.
Sorbitol RectalChildren 2–11 years of age: 30–60 mL of sorbitol 25–30% solution as an enema.
Children ≥12 years of age: 120 mL of sorbitol 25–30% solution as an enema.
Bowel Cleansing PEG 3350 (with Electrolytes) NasogastricChildren ≥6 months of age: 25 mL/kg (2.6 g/kg) per hour (NuLYTELYor Trilyte) until watery stool is clear or 4 L is consumed.
OralChildren ≥6 months of age: 25 mL/kg (2.6 g/kg) per hour (NuLYTELYor Trilyte) until watery stool is clear or 4 L is consumed.
Adults
Constipation Glycerin Rectal2–2.1 g as a suppository or 5.6 g (5.5. mL) as an enema.
If a bowel movement does not occur after using the glycerin suppository, discontinue drug.
Sorbitol Oral15 mL of sorbitol 70% solution until diarrhea occurs, as an adjunct to sodium polystyrene sulfonate; alternatively, 20–100 mL as an oral vehicle for the resin.
Rectal120 mL of sorbitol 25–30% solution as an enema.
120 mL of sorbitol 25–30% solution as an enema, used as an adjunct to sodium polystyrene sulfonate.
PEG 3350 Oral17 g (MiraLAX) daily as needed for up to 7 days.
Bowel Cleansing PEG 3350 (with Electrolytes) Nasogastric4 L at a rate of 20–30 mL (1.18–1.77 g [Golytely]; 2.1–3.15 g [Nulytely]; 1.2–1.8 g [Colyte]) per minute (1.2–1.8 L/hour).
OralSingle-dose regimen: 240 mL (about 14 g [GoLYTELY], 25 g [NuLYTELY], about 14 g [Colyte], 25 g [Trilyte]) every 10 minutes until rectal output is clear or 4 L is consumed.
Single-dose regimen: 240 mL (24 g [MoviPrep]) every 15 minutes until 1 L is consumed; repeat 1.5 hours later and drink an additional 1 L of clear liquid.
Divided-dose regimen: Evening before procedure, 240 mL (24 g [MoviPrep]) every 15 minutes until 1 L is consumed; drink an additional 0.5 L of clear liquid. On the morning of the procedure, 240 mL (24 g [MoviPrep]) every 15 minutes until 1 L is consumed; drink an additional 0.5 L of clear liquid at least 1 hour prior to the procedure.
Combination PEG 3350 electrolyte solution and bisacodyl (HalfLytely): Initially, 20 mg (four 5-mg bisacodyl delayed-release tablets); wait for a bowel movement (or maximum of 6 hours). Follow with 240 mL of PEG 3350 electrolyte solution every 10 minutes until 2 L has been consumed.
Prescribing Limits
Pediatric Patients
Constipation Glycerin RectalChildren 2 to <6 years of age: Maximum 1.2 g (as suppository) daily or 2.3 g (2.3 mL) (as an enema) daily.
Children ≥6 years of age: Maximum 2.1 g (as suppository) daily or 5.6 g (5.5 mL) (as an enema) daily.
Adults
Constipation Glycerin RectalMaximum 2.1 g (as suppository) daily or 5.6 g (5.5 mL) (as an enema) daily.
PEG 3350 Oral17 g (MiraLAX) daily for up to 7 days.
Special Populations
No special population dosage recommendations at this time.
Warnings
Contraindications
Warnings/Precautions
Warnings
Long-term or Chronic UseLong-term use of laxatives has been associated with laxative dependence, chronic constipation, and loss of normal bowel function.
Chronic use or overdosage of laxatives may produce persistent diarrhea, hypokalemia, loss of essential nutritional factors, and dehydration.
Seizures Associated with Electrolyte AbnormalitiesGeneralized tonic-clonic seizures associated with electrolyte abnormalities (e.g., hyponatremia, hypokalemia) have been reported following use of PEG 3350 electrolyte solutions for bowel cleansing in patients without a history of seizures. Such neurologic effects resolved with correction of fluid and electrolyte abnormalities.
Use PEG 3350 electrolyte solutions with caution in patients receiving drugs that increase risk of electrolyte abnormalities (e.g., diuretics, ACE inhibitors). Consider performing baseline and postcolonoscopy electrolyte tests in these patients.
Ulcerative ColitisUse PEG 3350 electrolyte solutions (Golytely, Colyte, MoviPrep) with caution in patients with severe ulcerative colitis.
Combined PreparationsWhen used in combination with bisacodyl, consider the precautions, cautions, and contraindications associated with bisacodyl.
If large volumes of liquid containing sugars (e.g., Gatorade) are added to PEG 3350 (with electrolytes) powder for solution, the sugars may reach the colon and be converted to methane or other flammable gases. If electrocautery is used for polyp removal, possible risk that such gases could ignite and explode.
Sensitivity Reactions
Following administration of PEG 3350 electrolyte solutions, isolated cases of urticaria, rhinorrhea, dermatitis, and, rarely, anaphylactic reactions have been reported.
General Precautions
PhenylketonuriaIndividuals with phenylketonuria and other individuals who must restrict their intake of phenylalanine should be warned that MoviPrep (PEG 3350 electrolyte solution) contains aspartame (NutraSweet), which is metabolized in the GI tract to provide a maximum of 2.33 mg of phenylalanine per treatment (2 L of solution).
Glucose-6-Phosphate Dehydrogenase (G-6-PD)MoviPrep (PEG 3350 electrolyte solution) contains 5.9 g of sodium ascorbate and 4.7 g of ascorbic acid. Use with caution in patients with G-6-PD deficiency (especially those with active infection, history of hemolysis, or taking concomitant drugs known to precipitate hemolytic reactions), since patients with G-6-PD deficiency have developed hemolysis after large IV or oral doses of ascorbic acid.
GI EffectsGlycerin: If rectal bleeding occurs, discontinue the drug and consult a clinician.
PEG 3350 solution (MiraLAX): If rectal bleeding, nausea, bloating, cramping, or abdominal pain worsens, or the patient requires >7 days of use or experiences diarrhea, discontinue the drug and contact a clinician.
PEG 3350 electrolyte solutions: If severe bloating, distention, or abdominal pain occurs, slow or temporarily discontinue administration until symptoms subside. If GI obstruction or perforation is suspected, perform appropriate tests to rule out these conditions before PEG 3350 electrolyte solution administration.
Specific Populations
PregnancyCategory C (PEG 3350 electrolyte solution).
LactationNot known whether PEG 3350 electrolyte solution is distributed into milk. Use with caution in nursing women.
Pediatric UseAvoid use of laxatives in infants and children; childhood constipation is best treated by counseling parents on acceptable variations in the frequency of bowel movements.
Safety and efficacy of glycerin preparations not established in pediatric patients <2 years of age.
PEG 3350 (MiraLAX): Safety and efficacy not established in pediatric patients <17 years of age.
PEG 3350 electrolyte solutions (NuLYTELY, Trilyte): Safety and efficacy not established in pediatric patients <6 months of age. Closely monitor children <2 years of age receiving NuLYTELY for signs of hypoglycemia.
PEG 3350 electrolyte solutions (GoLYTELY, Colyte, MoviPrep): Safety and efficacy not established in pediatric patients.
Geriatric UsePEG 3350 electrolyte solutions (MoviPrep, HalfLytely): No substantial differences in safety and efficacy relative to younger adults.
PEG 3350 electrolyte solutions (MoviPrep): Possibility exists of greater sensitivity to the drug in some geriatric individuals.
Serious adverse reactions (e.g., Mallory-Weiss syndrome, asystole, sudden dyspnea with pulmonary edema, infiltrates on chest radiograph after vomiting and aspirating PEG 3350) reported in patients >60 years of age receiving PEG 3350 electrolyte solutions.
Renal ImpairmentUse laxative products containing >50 mEq of magnesium, >25 mEq of potassium, or ≥1 mEq of sodium per dose with caution in patients with renal disease and only under supervision of a clinician. Monitor electrolytes.
Common Adverse Effects
Glycerin (rectal): Rectal discomfort, burning, or irritation; rectal mucosa hyperemia (with minimal hemorrhage and mucus discharge); griping; cramping pain; tenesmus.
Sorbitol (rectal) used as adjunct to sodium polystyrene sulfonate: Diarrhea.
PEG 3350 electrolyte solutions (oral or nasogastric): Malaise, nausea, abdominal distention, abdominal fullness and/or bloating, abdominal cramps, vomiting, anal irritation, thirst.
What other drugs will affect Hyperosmotic Laxatives
By increasing intestinal motility, laxatives may potentially decrease transit time of concomitantly administered oral drugs and decrease their absorption; administer other oral drugs at least 1 hour before PEG 3350 electrolyte solution.
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