Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
DIGOXIN PEDIATRIC vs ANEXSIA 7.5/325
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Inhibits sodium-potassium ATPase, increasing intracellular sodium, which promotes calcium influx via sodium-calcium exchanger, enhancing cardiac contractility. Also increases vagal tone, slowing AV conduction.
Hydrocodone is a mu-opioid receptor agonist, producing analgesia and euphoria. Acetaminophen inhibits cyclooxygenase (COX) enzymes, reducing prostaglandin synthesis and providing analgesic and antipyretic effects.
Heart failure (FDA-approved for pediatric patients with heart failure),Atrial fibrillation (off-label for rate control in pediatric patients)
Management of moderate to moderately severe pain where treatment with an opioid is appropriate and for which alternative treatments are inadequate
For pediatric patients, digoxin pediatric dosing is weight-based; no standard adult dose. Typical pediatric loading dose: 10-12 mcg/kg orally divided every 6-8 hours, with maintenance: 5-10 mcg/kg/day divided every 12 hours. For infants <1 month, loading: 10-15 mcg/kg, maintenance: 4-6 mcg/kg/day. For children 1-24 months, loading: 15-20 mcg/kg, maintenance: 5-8 mcg/kg/day. For children >2 years, loading: 10-15 mcg/kg, maintenance: 3-5 mcg/kg/day.
1 tablet (hydrocodone 7.5 mg / acetaminophen 325 mg) orally every 4 to 6 hours as needed for pain; maximum 6 tablets per day (hydrocodone 45 mg / acetaminophen 1950 mg).
Terminal elimination half-life in neonates is 35-70 hours, infants 18-30 hours, children 12-30 hours, and adults 36-48 hours; prolonged in renal impairment and hypothyroidism.
Hydrocodone: 3.8-4.5 hours (immediate-release). Acetaminophen: 2-3 hours. Clinical note: Half-life prolonged in hepatic impairment; requires dose adjustment.
Primarily renally excreted unchanged; minimal hepatic metabolism (mostly via reduction, hydrolysis, and conjugation in older children).
Hydrocodone: CYP3A4 and CYP2D6; Acetaminophen: primarily via glucuronidation (UGT1A1, UGT1A6, UGT1A9) and sulfation, with minor oxidation by CYP2E1.
Renal excretion accounts for 50-70% of elimination as unchanged drug; biliary/fecal excretion accounts for 30-40%, primarily as metabolites; enterohepatic recirculation occurs.
Renal: ~90-100% as hydrocodone metabolites (conjugated) and unchanged hydrocodone; ~60% as acetaminophen metabolites (glucuronide, sulfate, cysteine); <5% unchanged acetaminophen. Biliary/fecal: <5%.
25% bound to serum albumin; binding decreases in uremia and hyperbilirubinemia.
Hydrocodone: ~20-30% (albumin). Acetaminophen: ~10-25% (albumin).
Vd: 6-10 L/kg in infants and children, 5-7 L/kg in adults; large Vd indicates extensive tissue binding, particularly to cardiac muscle (Na+/K+-ATPase).
Hydrocodone: 3-4 L/kg (extensive tissue distribution). Acetaminophen: ~1 L/kg (uniformly distributed).
Oral: 60-80% (elixir 70-85%, tablets 60-75%); IM: 70-85% (but erratic absorption and pain limit use); IV: 100%.
Oral: Hydrocodone ~70% (high first-pass metabolism); Acetaminophen ~85-90% (minimal first-pass).
Digoxin is primarily renally excreted. For pediatric patients, if GFR <30 m L/min/1.73m2, reduce maintenance dose by 50% and monitor serum levels. For GFR 30-60, reduce dose by 25-50%. In neonates with renal impairment, dose reduction proportional to creatinine clearance.
For GFR 30-59 m L/min: administer every 6 hours; maximum 4 tablets per day. For GFR 15-29 m L/min: administer every 8 hours; maximum 3 tablets per day. For GFR <15 m L/min: not recommended due to accumulation of metabolites.
Digoxin is minimally hepatically metabolized; no dose adjustment required for hepatic impairment. However, in Child-Pugh class C, monitor levels due to potential altered distribution.
Child-Pugh Class A: no adjustment necessary. Child-Pugh Class B: reduce dose by 25-50% and extend dosing interval to every 6-8 hours; maximum 4 tablets per day. Child-Pugh Class C: contraindicated due to risk of hepatotoxicity.
See standard_dosing. Weight-based dosing: total digitalizing dose (TDD) and maintenance as above. For premature infants, TDD 10-15 mcg/kg, maintenance 3-5 mcg/kg/day divided q12h. For full term neonates, TDD 15-20 mcg/kg, maintenance 5-7 mcg/kg/day. For infants 1-24 months, TDD 20-25 mcg/kg, maintenance 7-10 mcg/kg/day. For children 2-10 years, TDD 10-15 mcg/kg, maintenance 5-7 mcg/kg/day. For children >10 years, TDD 10-15 mcg/kg, maintenance 3-5 mcg/kg/day. Divide TDD into 3-4 doses every 6-8 hours. Maintenance started 12 hours after last loading dose.
Not recommended for pediatric patients; safety and efficacy not established for children under 18 years. For adolescents ≥18 years: adult dosing.
Not applicable for pediatric formulation. For elderly, use adult digoxin dosing with caution: reduced renal function may require lower maintenance doses. Typical adult maintenance: 0.0625-0.25 mg daily based on renal function and lean body mass.
Initiate at 1 tablet (hydrocodone 5 mg / acetaminophen 325 mg) every 6 hours as needed; titrate cautiously due to increased sensitivity, decreased renal function, and risk of respiratory depression. Maximum 4 tablets per day.
Toxicity can be life-threatening. Use caution in renal impairment, electrolyte disturbances (hypokalemia, hypomagnesemia, hypercalcemia). Narrow therapeutic index requires monitoring.
Addiction, abuse, and misuse; life-threatening respiratory depression; accidental ingestion; neonatal opioid withdrawal syndrome; risks from concomitant use with benzodiazepines or other CNS depressants; hepatotoxicity due to acetaminophen.
Monitor serum digoxin levels, renal function, electrolytes (potassium, magnesium, calcium). Risk of arrhythmias (including ventricular fibrillation, bradycardia, AV block). Use with caution in patients with thyroid disease, acute myocardial infarction, or myocarditis.
Risk of opioid addiction, abuse, and misuse; life-threatening respiratory depression; accidental ingestion; neonatal opioid withdrawal syndrome; risks from concomitant use of alcohol, benzodiazepines, or other CNS depressants; hepatotoxicity; severe hypotension; adrenal insufficiency; seizures; GI obstruction; impaired mental/physical abilities; use in elderly, cachectic, or debilitated patients; renal impairment; hepatic impairment; pregnancy; labor and delivery; nursing mothers; pediatric use; driving and operating machinery.
Ventricular fibrillation, hypersensitivity to digitalis preparations, hypokalemia (uncorrected), hypercalcemia (uncorrected), AV block (second or third degree) unless pacemaker present.
Significant respiratory depression; acute or severe bronchial asthma; known or suspected GI obstruction; hypersensitivity to hydrocodone or acetaminophen; concomitant use of MAOIs or within 14 days of such therapy.
High-fiber foods may decrease absorption; take digoxin 1 hour before or 2 hours after meals. Avoid natural licorice, which can cause hypokalemia and increase toxicity. Maintain consistent dietary potassium intake.
Avoid alcohol consumption due to increased risk of acetaminophen hepatotoxicity and CNS depression. No specific food restrictions, but grapefruit juice may theoretically affect hydrocodone metabolism via CYP3A4 inhibition; however, clinical significance is uncertain.
Digoxin crosses the placenta. First trimester: No increased risk of major malformations reported in human studies. Second/third trimester: Potential for fetal toxicity (e.g., bradycardia, cardiac arrhythmias) at maternal toxic doses. No known teratogenicity at therapeutic doses.
FDA Category C (hydrocodone) and Category D (acetaminophen) in third trimester. First trimester: Acetaminophen associated with rare gastroschisis; hydrocodone risk of neural tube defects. Second trimester: No major malformations except with prolonged opioid use. Third trimester: Acetaminophen safe; hydrocodone risk of neonatal opioid withdrawal syndrome (NOWS). Avoid near term.
Digoxin is excreted into breast milk in low concentrations. M/P ratio approximately 0.6–0.9. Infant dose via milk is <1% of maternal weight-adjusted dose, unlikely to cause adverse effects in term infants. Caution in preterm or neonates with renal impairment.
Hydrocodone/acetaminophen excreted in breast milk. M/P ratio unknown. Hydrocodone relative infant dose <3% of weight-adjusted maternal dose. Acetaminophen relative infant dose <2%. Use with caution; monitor infant for sedation, apnea, poor feeding. Highest risk in CYP2D6 ultrarapid metabolizers.
During pregnancy, increased volume of distribution and renal clearance may reduce serum digoxin levels. Dose adjustments may be required based on therapeutic drug monitoring; typical dose increase of 20–30% in third trimester. Postpartum, reduce dose to prepregnancy level to avoid toxicity.
Increased clearance of hydrocodone in pregnancy may require dose adjustment; monitor for inadequate analgesia. Acetaminophen pharmacokinetics unchanged. Avoid high doses (hepatotoxicity risk). Consider baseline hepatic function. No specific dose adjustment recommended; titrate to effect.
Monitor serum digoxin levels (therapeutic range 0.5-2 ng/m L) and renal function, especially in neonates. Correct hypokalemia, hypomagnesemia, and hypercalcemia before administration to reduce toxicity risk. Use with caution in patients with WPW, hypertrophic cardiomyopathy, or incomplete heart block. Dosing in infants and children is based on weight and renal function.
ANEXSIA 7.5/325 (hydrocodone/acetaminophen) carries a boxed warning for acetaminophen hepatotoxicity; maximum acetaminophen dose from all sources should not exceed 4 g/day. Hydrocodone is metabolized by CYP2D6 to hydromorphone; ultrarapid metabolizers may experience toxicity. Avoid concurrent use with other CNS depressants including alcohol. Prescribe with caution in patients with renal impairment (hydrocodone accumulation) or hepatic impairment (acetaminophen toxicity). Monitor for signs of respiratory depression, especially at therapy initiation and dose titration. Use the lowest effective dose for the shortest duration.
Take exactly as prescribed; do not double up doses.,Monitor for signs of toxicity: nausea, vomiting, vision changes (yellow-green halos), arrhythmias.,Keep medication out of reach of children; immediate medical attention if overdose suspected.,Do not stop abruptly without consulting healthcare provider.,Inform healthcare provider of all medications, including OTC and herbal supplements.
Do not exceed 6 tablets per day due to acetaminophen content.,Avoid alcohol while taking this medication.,Do not drive or operate heavy machinery until you know how this medication affects you.,Take exactly as prescribed; do not share with others.,Seek emergency help if you experience difficulty breathing, severe drowsiness, or signs of allergic reaction.,Store securely out of reach of children and dispose of unused medication properly.
"Eflornithine, an ornithine decarboxylase inhibitor used in the treatment of African trypanosomiasis and hirsutism, may reduce the therapeutic efficacy of digoxin, a cardiotonic glycoside used for heart failure and atrial fibrillation. The proposed mechanism involves eflornithine-induced alterations in gastrointestinal motility or absorption, potentially decreasing digoxin bioavailability. This could lead to subtherapeutic digoxin levels, diminished inotropic and chronotropic effects, and increased risk of arrhythmias or worsening heart failure."
"Osimertinib, a tyrosine kinase inhibitor used in non-small cell lung cancer, can inhibit P-glycoprotein (P-gp) transport in the gastrointestinal tract and kidneys, leading to increased absorption and reduced renal clearance of digoxin. This elevation in serum digoxin concentration heightens the risk of digoxin toxicity, including cardiac arrhythmias (e.g., bradycardia, atrial tachycardia with block) and gastrointestinal symptoms such as nausea and vomiting. Clinical monitoring for digoxin toxicity is warranted, especially when initiating or adjusting osimertinib therapy."
"Lenvatinib, a tyrosine kinase inhibitor, may reduce the therapeutic efficacy of digoxin by interfering with its cardiotonic effects. This interaction could lead to decreased inotropic support in patients with heart failure, potentially worsening cardiac function and clinical outcomes. The clinical consequence is a possible loss of rate control in atrial fibrillation or diminished contractility in systolic dysfunction."
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about DIGOXIN PEDIATRIC vs ANEXSIA 7.5/325, answered by our medical review team.
DIGOXIN PEDIATRIC is a Cardiac Glycoside that works by Inhibits sodium-potassium ATPase, increasing intracellular sodium, which promotes calcium influx via sodium-calcium exchanger, enhancing cardiac contractility. Also increases vagal tone, slowing AV conduction.. ANEXSIA 7.5/325 is a Opioid Analgesic Combination that works by Hydrocodone is a mu-opioid receptor agonist, producing analgesia and euphoria. Acetaminophen inhibits cyclooxygenase (COX) enzymes, reducing prostaglandin synthesis and providing analgesic and antipyretic effects.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between DIGOXIN PEDIATRIC and ANEXSIA 7.5/325 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 DIGOXIN PEDIATRIC is: For pediatric patients, digoxin pediatric dosing is weight-based; no standard adult dose. Typical pediatric loading dose: 10-12 mcg/kg orally divided every 6-8 hours, with maintenance: 5-10 mcg/kg/day divided every 12 hours. For infants <1 month, loading: 10-15 mcg/kg, maintenance: 4-6 mcg/kg/day. For children 1-24 months, loading: 15-20 mcg/kg, maintenance: 5-8 mcg/kg/day. For children >2 years, loading: 10-15 mcg/kg, maintenance: 3-5 mcg/kg/day.. The standard adult dose of ANEXSIA 7.5/325 is: 1 tablet (hydrocodone 7.5 mg / acetaminophen 325 mg) orally every 4 to 6 hours as needed for pain; maximum 6 tablets per day (hydrocodone 45 mg / acetaminophen 1950 mg).. 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 DIGOXIN PEDIATRIC and ANEXSIA 7.5/325 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. DIGOXIN PEDIATRIC is classified as Category A/B. Digoxin crosses the placenta. First trimester: No increased risk of major malformations reported in human studies. Second/third trimester: Potential for fetal toxicity (e.g., brady. ANEXSIA 7.5/325 is classified as Category C. FDA Category C (hydrocodone) and Category D (acetaminophen) in third trimester. First trimester: Acetaminophen associated with rare gastroschisis; hydrocodone risk of neural tube d. Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.