Comparative Guidance for Hydrocodone/Acetaminophen (Norco) and Oxycodone/Acetaminophen (Percocet)

Opioid Component and Formulation

Regulatory Classification

Dosing and Administration

Clinical Efficacy

Safety Profile

Prescribing Recommendations

Opioid Equivalence and Dosage Considerations

Understanding Opioid Equivalence

• The CDC Clinical Practice Guideline recommends that hydrocodone has a conversion factor of 1.0, while oxycodone has a conversion factor of 1.5 when calculating morphine milligram equivalents (MME) 5
• Oxycodone is approximately 1.5 times more potent than hydrocodone on a milligram-to-milligram basis 5

Calculation of Equivalent Dose

• Norco 10-325 contains 10 mg of hydrocodone and 325 mg of acetaminophen 6, 7
• When taken every 4 hours, this equals 6 doses per day, totaling 60 mg of hydrocodone daily 7
• Using the 1:1.5 potency ratio (hydrocodone:oxycodone), 60 mg of hydrocodone would be equivalent to approximately 40 mg of oxycodone daily 5, 7

OxyContin Dosing Considerations

• OxyContin is an extended-release formulation of oxycodone intended for twice-daily dosing 6, 7, 8
• OxyContin (extended-release oxycodone) is indicated for chronic pain and should not be used for acute pain 7, 8
• Long-acting and extended-release opioids like OxyContin are for use in opioid-tolerant patients only and are not intended for use as an "as-needed" analgesic 7, 8

Cautions and Contraindications

• Extended-release oxycodone products like OxyContin should only be used in patients who are already opioid-tolerant 7, 8

OxyContin Dosing Considerations for Special Populations

Dosing Recommendations

• The American Association for the Study of Liver Diseases recommends that patients with end-stage liver disease avoid oxycodone entirely, and instead use paracetamol, morphine, and hydromorphone, with no dose reduction needed in elderly patients or those with moderate hepatic or renal failure when initiating the 10 mg dose 9, 10

Acetaminophen Dose Limits and Multimodal Analgesia in Acute Pain Management

Safety Limits for Acetaminophen

• In the treatment of acute pain, the total daily acetaminophen intake from any opioid‑acetaminophen combination product should be limited to 3,000–4,000 mg to prevent hepatotoxicity, and clinicians should avoid using combination tablets when higher opioid doses are needed, opting instead for separate opioid and acetaminophen prescriptions. 11

Role of Opioid‑Acetaminophen Combinations in Multimodal Analgesia

• For acute pain, guidelines recommend incorporating opioid‑acetaminophen combination agents as part of a multimodal analgesic strategy, which can reduce the required dose of each individual opioid and improve overall pain control. 12