Naloxegol oxalate

What Naloxegol oxalate is used for

Quoted from the “Indications and Usage” section of the FDA-approved label.

MOVANTIK ® is indicated for the treatment of opioid-induced constipation (OIC) in adult patients with chronic non-cancer pain, including patients with chronic pain related to prior cancer or its treatment who do not require frequent (e.g., weekly) opioid dosage escalation. …

— FDA label: Movantik, Averitas Pharma, Inc., effective September 1, 2026. Read the full label on DailyMed →

Label quoted: the one for the most common form (tablet, film coated, oral), Movantik, Averitas Pharma, Inc.; it covers 2 products in the FDA NDC Directory. The side effects, interactions, dosage and pregnancy quotes below come from this same label.

The FDA has 2 labels for products of this medicine (different makers and forms); uses can differ between them. Check the label that comes with your own medicine.

This page is not medical advice. Talk to your doctor or pharmacist before you start, stop or change any medicine.

Boxed warning

A boxed warning (“black box”) is the FDA’s strongest warning on a drug label, for serious or life-threatening risks.

The label quoted above has no boxed warning.

0 of 2 FDA labels for this medicine have a boxed warning.

Naloxegol oxalate side effects

Quoted from the “Adverse Reactions” section of the FDA-approved label. Tell your doctor about any side effect that worries you.

Serious and important adverse reactions described elsewhere in labeling include: Opioid withdrawal [see Warnings and Precautions (5.1)] Severe abdominal pain and/or diarrhea [see Warnings and Precautions (5.2)] Gastrointestinal perforation [see Warnings and Precautions (5.3)] The most common adverse reactions in clinical trials (≥3%) are: abdominal pain, diarrhea, nausea, flatulence, vomiting, and headache.

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(6.1) To report SUSPECTED ADVERSE REACTIONS, contact Averitas Pharma at 1-877-900-6479 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The data described below reflect exposure to MOVANTIK in 1497 patients in clinical trials, including 537 patients exposed for greater than six months, and 320 patients exposed for 12 months. The safety data described in Table 1 are derived from two double-blind, placebo-controlled trials (Studies 1 and 2) in patients with OIC and non-cancer related pain [see Clinical Studies (14)]. Study 3 (n=302) was a safety extension study that allowed patients from Study 1 to continue the same blinded treatment for an additional 12 weeks. Safety data for patients in Study 3 are similar to those listed in Table 1. Study 4 (n=844) was a Phase 3, 52-week, multi-center, open-label, randomized, parallel group, safety and tolerability study of naloxegol versus usual care treatment for OIC (as determined by the investigator and excluding peripheral opioid antagonists) in patients with non-cancer related pain. The population enrolled in Study 4 was similar to that of the other studies. Eligible patients were randomized in a 2:1 ratio to receive either naloxegol 25 mg once daily or usual care treatment for OIC. The most commonly used laxatives in the usual care group were rectal stimulants (e.g., bisacodyl), oral stimulants (e.g., senna), and oral osmotics (e.g., macrogol, magnesium). Safety data for patients in Study 4 are similar to those listed in Table 1. Table 1 lists adverse reactions in pooled Studies 1 and 2 occurring in ≥3% of patients receiving MOVANTIK 12.5 mg or 25 mg and at an incidence greater than placebo. Table 1.

— FDA label: Movantik, Averitas Pharma, Inc., effective September 1, 2026. This is part of the section. Read the full label on DailyMed →

Naloxegol oxalate drug interactions

Quoted from the “Drug Interactions” section of the FDA-approved label. Tell your pharmacist about every medicine, vitamin and herbal product you take.

Moderate CYP3A4 inhibitors (e.g., diltiazem, erythromycin, verapamil): Increased naloxegol concentrations; avoid concomitant use; if unavoidable, reduce dosage to 12.5 mg once daily and monitor for adverse reactions. (2.4, 7.1) Strong CYP3A4 inducers (e.g., rifampin): Decreased concentrations of naloxegol; concomitant use is not recommended. (7.1) Other opioid antagonists: Potential for additive effect and increased risk of opioid withdrawal; avoid concomitant use.

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(7.1) 7.1 Effects of Other Drugs on MOVANTIK Table 2 displays the effects of other drugs on MOVANTIK. Table 2. Effects of Other Drugs on MOVANTIK Concomitant Agent Mechanism of Action Clinical Recommendation CYP3A4 Inhibitors

• Strong CYP3A4 inhibitors (e.g., ketoconazole, itraconazole, clarithromycin)
• Increase plasma naloxegol concentrations and may increase the risk of adverse reactions [see Clinical Pharmacology (12.3)].
• Use with strong CYP3A4 inhibitors is contraindicated [see Contraindications (4)].
• Moderate CYP3A4 inhibitors (e.g., diltiazem, erythromycin, verapamil)
• Avoid use with moderate CYP3A4 inhibitors; if unavoidable, decrease the dosage of MOVANTIK to 12.5 mg once daily and monitor for adverse reactions [see Dosage and Administration (2.4)].
• Weak CYP3A4 inhibitors (e.g., quinidine, cimetidine)
• Clinically significant increases in naloxegol concentrations are not expected.
• No dosage adjustments are necessary.
• Grapefruit or grapefruit juice The effect of grapefruit juice varies widely among brands and is concentration-, dose-, and preparation-dependent. Studies have shown that it can be classified as a “strong CYP3A inhibitor” when a certain preparation was used (e.g., high dose, double strength) or as a “moderate CYP3A inhibitor” when another preparation was used (e.g., low dose, single strength).
• Can increase plasma naloxegol concentrations.
• Avoid consumption of grapefruit or grapefruit juice during treatment with MOVANTIK [see Dosage and Administration (2.1)]. CYP3A4 Inducers
• Strong CYP3A4 inducers (e.g., rifampin, carbamazepine, St. John’s Wort)
• Significantly decrease plasma naloxegol concentrations and may decrease the efficacy of MOVANTIK [see Clinical Pharmacology (12.3)].
• Use with strong CYP3A4 inducers is not recommended. Other Drug Interactions
• Other opioid antagonists
• Potential for additive effect of opioid receptor antagonism and increased risk of opioid withdrawal.
• Avoid use of MOVANTIK with another opioid antagonist.

— FDA label: Movantik, Averitas Pharma, Inc., effective September 1, 2026. This is part of the section. Read the full label on DailyMed →

Naloxegol oxalate dosage

Quoted from the “Dosage and Administration” section of the FDA-approved label. Your own dose is the one your doctor prescribes: do not change it on your own.

Administration: Discontinue maintenance laxative therapy before starting MOVANTIK; may resume laxatives if patients have OIC symptoms after taking MOVANTIK for 3 days. (2.1) Alteration in analgesic dosing regimen prior to starting MOVANTIK is not required. (2.1) Patients receiving opioids for less than 4 weeks may be less responsive to MOVANTIK. (2.1) Take on an empty stomach at least 1 hour prior to the first meal of the day or 2 hours after the meal.

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(2.1) For patients who are unable to swallow the MOVANTIK tablet whole, the tablet can be crushed and given orally or administered via nasogastric tube, see full prescribing information. (2.1) Avoid consumption of grapefruit or grapefruit juice. (2.1, 7.1) Discontinue if treatment with the opioid pain medication is also discontinued. (2.1) Recommended dosage: 25 mg once daily; if not tolerated, reduce to 12.5 mg once daily. (2.2) Renal Impairment (CLcr < 60 mL/min): 12.5 mg once daily; increase to 25 mg once daily if tolerated and monitor for adverse reactions. (2.3, 8.6) 2.1 Administration Instructions Discontinue all maintenance laxative therapy prior to initiation of MOVANTIK. Laxative(s) can be used as needed if there is a suboptimal response to MOVANTIK after three days. Alteration in analgesic dosing regimen prior to initiating MOVANTIK is not required. Patients receiving opioids for less than 4 weeks may be less responsive to MOVANTIK [see Clinical Studies (14)]. Take MOVANTIK on an empty stomach at least 1 hour prior to the first meal of the day or 2 hours after the meal. For patients who are unable to swallow the MOVANTIK tablet whole, the tablet can be crushed to a powder, mixed with 4 ounces (120 mL) of water, and drunk immediately. The glass should be refilled with 4 ounces (120 mL) of water, stirred and the contents drunk. MOVANTIK can also be administered via a nasogastric (NG) tube, as follows: 1. Flush the NG tube with 1 ounce (30 mL) of water using a 60 mL syringe. 2. Crush the tablet to a powder in a container and mix with approximately 2 ounces (60 mL) of water. 3. Draw up the mixture using the 60 mL syringe and administer the syringe contents through the NG tube. 4. Add approximately 2 ounces (60 mL) of water to the same container used to prepare the dose of MOVANTIK. 5. Draw up the water using the same 60 mL syringe and use all the water to flush the NG tube and any remaining medicine from the NG tube into the stomach. Avoid consumption of grapefruit or grapefruit juice during treatment with MOVANTIK. Discontinue MOVANTIK if treatment with the opioid pain medication is also discontinued. 2.2 Adult Dosage The recommended MOVANTIK dosage is 25 mg once daily in the morning. If patients are not able to tolerate MOVANTIK, reduce the dosage to 12.5 mg once daily [see Clinical Pharmacology (12.2)]. 2.3 Dosage in Adult Patients with Renal Impairment The starting dosage for patients with creatinine clearance (CLcr) <60 mL/min (i.e., patients with moderate, severe, or end-stage renal impairment) is 12.5 mg once daily.

— FDA label: Movantik, Averitas Pharma, Inc., effective September 1, 2026. This is part of the section. Read the full label on DailyMed →

Naloxegol oxalate in pregnancy

Quoted from the pregnancy part of the FDA-approved label. Ask your doctor before you take any medicine while pregnant or planning a pregnancy.

Risk Summary Limited available data with MOVANTIK use in pregnant women are insufficient to inform a drug associated risk of adverse developmental outcomes. MOVANTIK may precipitate opioid withdrawal in the pregnant women and the fetus (see Clinical Considerations).

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In animal development studies, no effects on embryo-fetal development were observed following administration of naloxegol in pregnant rats during the period of organogenesis at doses up to 1452 times the human AUC (area under the plasma concentration-time curve) at the maximum recommended human dose. No effects on embryo-fetal development were observed following administration of naloxegol in pregnant rabbits during the period of organogenesis at doses up to 409 times the human AUC at the maximum recommended human dose. The estimated background risk of major birth defects and miscarriage for the indicated populations are unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically-recognized pregnancies is 2% to 4% and 15% to 20%, respectively. Clinical Considerations Maternal and Fetal/Neonatal adverse reactions The use of MOVANTIK may be associated with opioid withdrawal in the pregnant woman and the fetus. Data Animal Data Oral administration of up to 750 mg/kg/day naloxegol in rats (1452 times the human AUC at the maximum recommended human dose) and 450 mg/kg/day naloxegol in rabbits (409 times the human AUC at the maximum recommended human dose) during the period of organogenesis produced no adverse effects on embryo-fetal development. Oral administration of up to 500 mg/kg/day in rats (195 times the maximum recommended human dose based on body surface area) during the period of organogenesis through lactation produced no adverse effects on parturition or the offspring.

— FDA label: Movantik, Averitas Pharma, Inc., effective September 1, 2026. Read the full label on DailyMed →

When Naloxegol oxalate should not be used

Quoted from the “Contraindications” section of the FDA-approved label.

MOVANTIK is contraindicated in: Patients with known or suspected gastrointestinal obstruction and patients at risk of recurrent obstruction, due to the potential for gastrointestinal perforation [see Warnings and Precautions (5.3)].

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Patients concomitantly using strong CYP3A4 inhibitors (e.g., clarithromycin, ketoconazole) because these medications can significantly increase exposure to naloxegol which may precipitate opioid withdrawal symptoms such as hyperhidrosis, chills, diarrhea, abdominal pain, anxiety, irritability, and yawning [see Drug Interactions (7.1) and Clinical Pharmacology (12.3)]. Patients who have had a known serious or severe hypersensitivity reaction to MOVANTIK or any of its excipients [see Adverse Reactions (6.2)]. Patients with known or suspected gastrointestinal obstruction and at risk of recurrent obstruction. (4, 5.3) Concomitant use with strong CYP3A4 inhibitors (e.g., clarithromycin, ketoconazole). (4, 7.1) Known serious or severe hypersensitivity reaction to MOVANTIK or any of its excipients. (4)

— FDA label: Movantik, Averitas Pharma, Inc., effective September 1, 2026. Read the full label on DailyMed →

Naloxegol oxalate overdose

Quoted from the “Overdosage” section of the FDA-approved label. If someone may have taken too much, call Poison Help at 1-800-222-1222 (or 911 in an emergency).

In a clinical study of patients with OIC a daily dose of 50 mg (twice the recommended dosage), administered over 4 weeks, was associated with an increased incidence of GI adverse reactions, such as abdominal pain, diarrhea, and nausea. These adverse reactions frequently occurred within 1-2 days after dosing. No antidote is known for naloxegol. Dialysis was noted to be ineffective as a means of elimination in a clinical study in patients with renal failure.

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If a patient on opioid therapy receives an overdose of naloxegol, the patient should be monitored closely for potential evidence of opioid withdrawal symptoms such as chills, rhinorrhea, diaphoresis, or reversal of central analgesic effect. Base treatment on the degree of opioid withdrawal symptoms, including changes in blood pressure and heart rate, and on the need for analgesia.

— FDA label: Movantik, Averitas Pharma, Inc., effective September 1, 2026. Read the full label on DailyMed →

Forms and how it is given

Companies that list this medicine

Labelers in the FDA NDC Directory: the company named on the package (maker or distributor), with the number of prescription products.

• Averitas Pharma, Inc.2 products
• RedHill Biopharma Ltd1 product

FDA approval history

• NDA: New Drug Application: how a new (usually brand-name) medicine is approved.

Shortage status

The FDA drug shortage list does not show these products.

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Recalls

No recall linked to these products (by their NDC code) appears in the FDA enforcement reports.

Official identifiers

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Sources

1. FDA-approved label on DailyMed (National Library of Medicine) — Movantik, Averitas Pharma, Inc., effective September 1, 2026; via openFDA, FDA data exported October 30, 2026, retrieved October 31, 2026
2. NDC Directory (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 30, 2026, retrieved October 31, 2026
3. Drugs@FDA (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 30, 2026, retrieved October 31, 2026
4. Drug recall enforcement reports (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 27, 2026, retrieved October 31, 2026
5. Drug shortages (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 30, 2026, retrieved October 31, 2026

openFDA data is provided by the FDA as is; it may be incomplete. Always rely on the label that comes with your medicine. FDA Enforcement Report search →

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