Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
NALBUPHINE vs CODOXY
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Mixed opioid agonist-antagonist; agonist at κ-opioid receptors and antagonist/partial agonist at μ-opioid receptors.
Oxycodone is a full opioid agonist with relative selectivity for the mu-opioid receptor, although it can bind to other opioid receptors at higher doses. The principal therapeutic action of oxycodone is analgesia. Like all full opioid agonists, there is no ceiling effect for analgesia. Oxycodone is combined with aspirin to provide additive analgesic effects.
Moderate to severe pain,Supplement to balanced anesthesia,Preoperative and postoperative analgesia,Obstetrical analgesia during labor and delivery
Management of moderate to moderately severe pain where the use of an opioid analgesic is appropriate
10-20 mg IV/IM/SC every 3-6 hours as needed for pain; maximum single dose 20 mg, maximum total daily dose 160 mg.
1-2 capsules orally every 4-6 hours as needed for pain, not to exceed 8 capsules per day. Each capsule contains 5 mg hydrocodone bitartrate and 325 mg acetaminophen.
Terminal elimination half-life is 5 hours; clinically, in hepatic impairment or elderly, half-life may be prolonged up to 8-10 hours.
Terminal half-life is 3.5 hours in patients with normal renal function; extends to 5-8 hours in moderate renal impairment.
Hepatic metabolism primarily via glucuronidation and oxidative pathways; minor involvement of CYP450 enzymes.
Oxycodone is metabolized by CYP3A4 and CYP2D6. N-demethylation to noroxycodone (via CYP3A4) is the primary metabolic pathway. CYP2D6-mediated O-demethylation to oxymorphone is a minor pathway but produces a more potent metabolite.
Primarily hepatic metabolism; <5% excreted unchanged in urine; about 70% excreted in feces via biliary elimination.
Renal excretion of unchanged drug accounts for approximately 70% of elimination; biliary/fecal excretion accounts for 30%.
Approximately 50% bound to plasma proteins, primarily albumin.
Approximately 92% bound to albumin.
2.3 L/kg; indicates extensive tissue distribution, consistent with moderate lipophilicity.
2.4 L/kg; indicates extensive tissue distribution.
Intravenous: 100%; Intramuscular: approximately 80%; Oral: negligible (<20%) due to extensive first-pass metabolism.
Oral: 60-70% due to first-pass metabolism.
Cr Cl 30-50 m L/min: administer 75% of normal dose every 6 hours; Cr Cl <30 m L/min: administer 50% of normal dose every 8 hours.
For GFR 30-50 m L/min: administer every 8 hours. For GFR 10-29 m L/min: administer every 12 hours. For GFR <10 m L/min: use not recommended.
Child-Pugh A: no adjustment; Child-Pugh B: reduce dose by 25%; Child-Pugh C: reduce dose by 50% or use alternative.
Child-Pugh Class A: no adjustment. Child-Pugh Class B: reduce dose by 50% and extend interval to every 8 hours. Child-Pugh Class C: contraindicated.
0.1-0.2 mg/kg IV/IM/SC every 3-6 hours as needed; maximum single dose 20 mg.
For children ≥2 years: 0.1-0.2 mg/kg hydrocodone component every 4-6 hours as needed, maximum 6 doses per day. Use weight-based dosing; do not exceed acetaminophen 75 mg/kg/day.
Initiate at 50% of adult dose (5-10 mg) and titrate cautiously due to increased sensitivity and risk of respiratory depression.
Initiate at lowest effective dose (e.g., 1 capsule every 6 hours) due to increased risk of respiratory depression and falls. Titrate cautiously. Maximum 6 capsules per day.
Risk of respiratory depression, particularly in opioid-naive patients; risk of dependence and abuse; concomitant use with benzodiazepines or CNS depressants may cause profound sedation, respiratory depression, coma, and death.
Addiction, abuse, and misuse; life-threatening respiratory depression; accidental ingestion; neonatal opioid withdrawal syndrome; risks from concomitant use with benzodiazepines or other CNS depressants; and interactions with drugs affecting cytochrome P450 isoenzymes.
Respiratory depression may occur, especially in elderly, cachectic, or debilitated patients,Avoid use in patients with head injury or increased intracranial pressure,May precipitate withdrawal in opioid-dependent patients,Hypotension, biliary tract spasm, and seizure risk
Addiction, abuse, and misuse; life-threatening respiratory depression; accidental ingestion; neonatal opioid withdrawal syndrome; risks from concomitant use with benzodiazepines or other CNS depressants; severe hypotension; gastrointestinal obstruction; seizures; serotonin syndrome; adrenal insufficiency; and androgen deficiency.
Hypersensitivity to nalbuphine or any component,Significant respiratory depression,Acute or severe bronchial asthma in an unmonitored setting,Suspected or known gastrointestinal obstruction
Significant respiratory depression; acute or severe bronchial asthma in an unmonitored setting or in the absence of resuscitative equipment; known or suspected gastrointestinal obstruction, including paralytic ileus; hypersensitivity to oxycodone, aspirin, or any component of the formulation.
No significant food-drug interactions. Avoid alcohol and grapefruit juice as they may enhance CNS depression.
Avoid alcohol and grapefruit juice. Alcohol potentiates CNS depression. Grapefruit juice may increase codeine metabolism via CYP3A4, leading to variable effects. No significant food restrictions otherwise; take with food if GI upset occurs.
FDA Category C. First trimester: Limited human data, no evidence of major malformations in animal studies at 4-6x MRHD. Second/third trimester: Chronic use may cause neonatal opioid withdrawal syndrome (NOWS) including irritability, hypertonia, tremors, poor feeding. Use only if benefit outweighs risk.
No human data; animal studies not available. Avoid during pregnancy, especially first trimester, due to potential oxycodone-induced neural tube defects.
Excreted in human milk in low concentrations (M/P ratio ~0.6). Relative infant dose estimated 0.5-1% of maternal weight-adjusted dose. Monitor infant for sedation and poor feeding. American Academy of Pediatrics considers compatible with breastfeeding with caution.
Oxycodone is excreted into breast milk; M/P ratio ~3.6:1. Risk of infant sedation and respiratory depression. Contraindicated during breastfeeding.
No specific dose adjustments recommended for pregnancy. Increased clearance and volume of distribution in third trimester may potentially reduce efficacy; titrate to effect. Avoid in prolonged labor due to risk of fetal bradycardia.
No established dose adjustments; increased clearance in pregnancy may require higher doses for analgesia, but use is contraindicated.
Nalbuphine is a mixed agonist-antagonist opioid with a ceiling effect for respiratory depression, making it safer than pure agonists. It can precipitate withdrawal in opioid-dependent patients. Monitor for sedation and hypotension. Reversal with naloxone may be less effective. Use with caution in hepatic impairment. Not recommended for chronic pain due to psychotomimetic effects.
CODOXY is a fixed-dose combination of codeine (opioid) and doxylamine (antihistamine). Use lowest effective dose for shortest duration due to opioid dependence and respiratory depression risk. Avoid in children <12 years for post-tonsillectomy pain and in those <18 with respiratory compromise. Monitor for CNS depression, especially with alcohol. Doxylamine adds anticholinergic effects (constipation, dry mouth, urinary retention). Caution in elderly, renal impairment, and breastfeeding.
Take exactly as prescribed; do not increase dose or frequency without consulting your doctor.,Avoid alcohol and other central nervous system depressants (e.g., benzodiazepines, sleep aids) as they can increase dizziness and drowsiness.,Do not drive or operate heavy machinery until you know how nalbuphine affects you.,Report any signs of withdrawal (e.g., restlessness, tearing, runny nose, yawning, sweating) if you have been taking other opioids.,Seek emergency care if you experience trouble breathing, severe dizziness, or hallucinations.,Do not stop abruptly; tapering may be needed to avoid withdrawal symptoms.
Take exactly as prescribed; do not increase dose or frequency without consulting your doctor.,This medication may cause drowsiness, dizziness, or blurred vision; avoid driving or operating machinery until you know how it affects you.,Avoid alcohol and other sedatives (e.g., benzodiazepines, sleep aids) as they increase risk of severe drowsiness and breathing problems.,Do not use with other products containing codeine or antihistamines (including cough/cold medicines).,Store securely away from children; misuse can cause addiction, overdose, or death.,If you are pregnant, plan to become pregnant, or are breastfeeding, inform your healthcare provider before use.,Common side effects: constipation, dry mouth, nausea. Increase fluid intake and fiber to prevent constipation.,Seek emergency help if you experience slow or shallow breathing, confusion, or fainting.
"The combination of trifluoperazine, a phenothiazine antipsychotic, with nalbuphine, a mixed opioid agonist-antagonist, can lead to additive central nervous system (CNS) depression, including increased sedation, respiratory depression, and hypotension. Trifluoperazine may enhance the depressant effects of nalbuphine on the brainstem respiratory centers and vasomotor centers. Clinically, this interaction may result in excessive sedation, respiratory compromise, and orthostatic hypotension, particularly in elderly or debilitated patients."
"Combined use of nalbuphine, a mixed opioid agonist-antagonist, with entacapone, a catechol-O-methyltransferase (COMT) inhibitor, may increase the risk of opioid-related adverse effects, including respiratory depression and sedation, due to additive central nervous system depression. Entacapone can also inhibit the metabolism of catecholamines, potentially exacerbating opioid-induced constipation and urinary retention. Clinically, patients may experience enhanced sedation or respiratory compromise, particularly in elderly or debilitated populations."
"Concomitant use of clozapine and nalbuphine may potentiate central nervous system (CNS) depression, leading to additive sedative and respiratory depressant effects. Both drugs act on the CNS via distinct mechanisms but converge on common pathways, increasing the risk of hypotension, bradycardia, and profound sedation. Clinically, patients may experience excessive drowsiness, confusion, or respiratory compromise, particularly in those with pre-existing comorbidities or concurrent use of other CNS depressants."
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about NALBUPHINE vs CODOXY, answered by our medical review team.
NALBUPHINE is a Opioid Agonist-Antagonist that works by Mixed opioid agonist-antagonist; agonist at κ-opioid receptors and antagonist/partial agonist at μ-opioid receptors.. CODOXY is a Antitussive Combination that works by Oxycodone is a full opioid agonist with relative selectivity for the mu-opioid receptor, although it can bind to other opioid receptors at higher doses. The principal therapeutic action of oxycodone is analgesia. Like all full opioid agonists, there is no ceiling effect for analgesia. Oxycodone is combined with aspirin to provide additive analgesic effects.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between NALBUPHINE and CODOXY depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of NALBUPHINE is: 10-20 mg IV/IM/SC every 3-6 hours as needed for pain; maximum single dose 20 mg, maximum total daily dose 160 mg.. The standard adult dose of CODOXY is: 1-2 capsules orally every 4-6 hours as needed for pain, not to exceed 8 capsules per day. Each capsule contains 5 mg hydrocodone bitartrate and 325 mg acetaminophen.. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between NALBUPHINE and CODOXY in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. NALBUPHINE is classified as Category A/B. FDA Category C. First trimester: Limited human data, no evidence of major malformations in animal studies at 4-6x MRHD. Second/third trimester: Chronic use may cause neonatal opioi. CODOXY is classified as Category C. No human data; animal studies not available. Avoid during pregnancy, especially first trimester, due to potential oxycodone-induced neural tube defects.. Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.