No, Norco does not contain codeine.
Norco contains hydrocodone (not codeine) combined with acetaminophen. 1 These are two distinct opioid medications with different chemical structures and pharmacologic properties.
Key Distinctions Between Hydrocodone and Codeine
Hydrocodone (the opioid in Norco):
- A mu- and delta-opioid receptor agonist 2
- Available commercially only in combination products with acetaminophen or ibuprofen for immediate-release formulations 2
- Approximately equipotent with oral morphine, though equivalence data are not fully substantiated 2
- Classified as Schedule III when combined with acetaminophen (≤15 mg hydrocodone per dose) 3
Codeine (a different medication):
- A weak mu- and delta-opioid receptor agonist 2
- Functions as a prodrug requiring hepatic metabolism via CYP2D6 to morphine for analgesic effect 2, 4
- Has little direct analgesic effect itself 2
- Subject to significant genetic variability—poor metabolizers obtain reduced/no analgesia while rapid metabolizers may experience toxicity 2, 4
Norco Formulations
Norco is available in two strengths 1:
- Norco 7.5/325: 7.5 mg hydrocodone bitartrate + 325 mg acetaminophen
- Norco 10/325: 10 mg hydrocodone bitartrate + 325 mg acetaminophen
The FDA has limited acetaminophen content in all prescription combination products to ≤325 mg per dosage unit 2.
Clinical Implications
Why this distinction matters:
Genetic variability: Codeine's effectiveness depends on CYP2D6 polymorphism, affecting significant portions of various ethnic populations 2. Hydrocodone does not have this same limitation.
Comparative efficacy: Research demonstrates hydrocodone may be more effective than codeine for acute pain. One randomized trial showed significantly fewer treatment failures with hydrocodone/acetaminophen versus codeine/acetaminophen, with fewer CNS side effects (6 vs. 16 patients, p<0.005) 5. Another study found hydrocodone/acetaminophen superior in total pain relief compared to codeine/acetaminophen 6.
Prescribing considerations: Both are Schedule III when combined with acetaminophen 3, but they are pharmacologically distinct agents requiring separate prescriptions.
Common Pitfall
Do not confuse brand names with generic content. Norco specifically refers to hydrocodone/acetaminophen combinations. Codeine/acetaminophen combinations have different brand names (e.g., Tylenol #3, Tylenol #4) 7, 8.