Treatment of opioid-induced constipation (OIC) in patients with chronic non-cancer pain, including those with chronic pain related to prior cancer or its treatment who do not require frequent (e.g. weekly) opioid dose escalation.
Acts peripherally as a mu receptor antagonist, blocking opioid receptors in the GI tract.
Blocks constipating effects of opioids on the GI tract without loss of analgesia.
Absorption: Systemic absorption follows oral administration. A high-fat meal ↑ absorption.
Distribution: Does not cross the blood-brain barrier.
Metabolism and Excretion: Metabolized primarily by the CYP3A4 enzyme system; 68% excreted in feces, 16% in urine mostly as metabolites.
Half-life: 6–11 hr.
TIME/ACTION PROFILE (spontaneous bowel movement)
|PO||within 24 hr||unknown||unknown|
- Known/suspected/history of gastrointestinal obstruction;
- Severe hepatic impairment;
- Concurrent use of strong CYP3A4 inhibitors, strong CYP3A4 inducers, other opioid antagonists, or grapefruit/grapefruit juice;
- Severe hepatic impairment;
- Lactation: May precipitate opioid withdrawal in infant.
Use Cautiously in:
- Patients with disruption of the blood-brain barrier (may precipitate opioid withdrawal);
- Geri: Blood levels are ↑ in elderly Japanese patients;
- OB: May precipitate fetal opioid withdrawal (use only if potential benefit justifies potential risk to fetus);
- Pedi: Safety and effectiveness not established.
Adverse Reactions/Side Effects
GI: GASTROINTESTINAL PERFORATION, abdominal pain, diarrhea, flatulence, nausea, vomiting
Misc: opioid withdrawal
* CAPITALS indicate life-threatening.
Underline indicate most frequent.
- Strong CYP3A4 inhibitors, including clarithromycin and ketoconazole may ↑ risk of toxicity/adverse reactions; concurrent use contraindicated.
- Strong CYP3A4 inducers, including rifampin, may ↓ blood levels/effectiveness; concurrent use contraindicated.
- Other opioid antagonists may precipitate opioid withdrawal; concurrent use contraindicated.
- Moderate CYP3A4 inhibitors, including diltiazem, erythromycin, and verapamil, may ↑ risk of toxicity/adverse reactions; ↓ dose of methylnaltrexone.
- Concurrent use of methadone for pain ↑ risk of stomach pain and diarrhea.
Grapefruit/grapefruit juice may ↑ blood levels and the risk of toxicity/adverse reactions; avoid concurrent use.
PO: (Adults)25 mg once daily, if poorly tolerated ↓ dose to 12.5 mg once daily; Concurrent use of moderate CYP3A4 inhibitors–12.5 mg once daily (careful monitoring recommended).
PO: (Adults)CCr <60 mL/min–12.5 mg once daily initially, may be cautiously ↑ to 25 mg once daily if necessary with careful monitoring.
Tablets: 12.5 mg, 25 mg
- Assess bowel sounds and frequency, quantity, and consistency of stools periodically during therapy.
- Monitor pain intensity during therapy. Naloxegol does not affect pain or effects of opioid analgesics on pain control. Discontinue naloxegol if opioid analgesic is discontinued.
- Monitor for signs and symptoms of gastrointestinal perforation (severe, persistent or worsening abdominal pain) periodically during therapy. Discontinue naloxegol if symptoms occur.
- Discontinue all maintenance laxative therapy before starting naloxegol. If a suboptimal response occurs with naloxegol, laxatives may be used after 3 days.
- PO: Administer on an empty stomach at least 1 hr before first meal in morning or 2 hrs after meal. Tablet may be crushed to a powder, mixed with 4 ounces of water (120 mL) for patients with difficulty swallowing. Drink mixture immediately; refill glass with 120 mL water, stir and drink contents.
- May be administered by NG tube. Flush the NG tube with 1 ounce (30 mL) of water using a 60 mL syringe. Crush tablet to a powder and mix with 2 ounces (60 mL) of water. Draw up mixture using the 60 mL syringe and administer through the NG tube. Add 2 ounces (60 mL) of water to rinse container and administer to flush NG tube and any remaining medicine from NG tube into stomach.
- Avoid grapefruit and grapefruit juice during therapy.
- Instruct patient to take naloxegol on an empty stomach as directed. Laxatives should be stopped before starting naloxegol, but may be restarted after 3 days if needed. Advise patient to read Medication Guide prior to starting therapy and with each refill in case of changes.
- Caution patient to avoid grapefruit and grapefruit juice during therapy.
- Advise patient to notify health care professional immediately if stomach pain that does not go away occurs.
- Advise patient to notify health care professional if signs and symptoms of opioid withdrawal (sweating, chills, diarrhea, stomach pain, anxiety, irritability, yawning) occur. Patients taking methadone for pain are at increased risk for stomach pain and diarrhea.
- Instruct patient to stop taking naloxegol if they stop taking opioid medications.
- Instruct patient to notify health care professional of all Rx or OTC medications, vitamins, or herbal products being taken and consult health care professional before taking any new medications.
- Advise female patients to notify health care professional if pregnancy is planned or suspected and avoid breast feeding during therapy.
Relief of OIC, especially if opioid therapy has been for 4 wks or more.
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