Vicodin and Norco are essentially the same medication. Both are brand names for a combination of hydrocodone (an opioid painkiller) and acetaminophen (the active ingredient in Tylenol). The differences between them come down to how much acetaminophen each tablet contains and whether the brand is still on the market.
Same Active Ingredients, Slightly Different Formulas
Both Vicodin and Norco combine the same two drugs: hydrocodone for pain relief and acetaminophen to boost its effect. They come in the same three hydrocodone strengths (5 mg, 7.5 mg, and 10 mg). The only real difference is the amount of acetaminophen per tablet. Vicodin formulations contain 300 mg of acetaminophen, while Norco contains 325 mg. In practical terms, that 25 mg gap is negligible and doesn’t change how either medication works or feels.
This wasn’t always the case. Older versions of Vicodin once contained 500 mg or even 750 mg of acetaminophen per tablet. In 2011, the FDA asked manufacturers to cap acetaminophen at 325 mg per dose in all prescription combination painkillers, specifically to reduce the risk of liver damage from unintentional overdose. That ruling brought Vicodin’s acetaminophen content down and made the two brands nearly identical.
Vicodin Has Been Discontinued
The Vicodin brand name has been discontinued in the United States. Norco is still available, and generic versions of both formulations are widely prescribed. If your doctor writes a prescription for hydrocodone and acetaminophen today, you’ll most likely receive either Norco or a generic equivalent. Many people still use the name “Vicodin” casually to refer to any hydrocodone/acetaminophen pill, but the actual branded product is no longer manufactured.
Available Strengths
Whether labeled as Norco or sold as a generic, hydrocodone/acetaminophen tablets currently come in these combinations:
- 2.5/325: 2.5 mg hydrocodone, 325 mg acetaminophen
- 5/300 or 5/325: 5 mg hydrocodone, 300 or 325 mg acetaminophen
- 7.5/300 or 7.5/325: 7.5 mg hydrocodone, 300 or 325 mg acetaminophen
- 10/300 or 10/325: 10 mg hydrocodone, 300 or 325 mg acetaminophen
A liquid oral solution is also available for people who have difficulty swallowing tablets.
Why the Acetaminophen Content Matters
The reason the FDA capped acetaminophen in these products is liver safety. Acetaminophen is processed by the liver, and taking more than 4,000 mg in a 24-hour period can cause serious liver damage. At high doses, the liver produces a toxic byproduct faster than it can neutralize it, which leads to cell death in liver tissue.
This becomes a real concern with combination painkillers because people sometimes take extra doses for pain without realizing how much acetaminophen they’re accumulating. If you’re also taking over-the-counter cold medicine, headache pills, or sleep aids that contain acetaminophen, the total can add up quickly. The lower per-tablet amounts in today’s formulations give more of a safety margin, but keeping track of all your acetaminophen sources still matters.
Controlled Substance Classification
Both Vicodin and Norco are classified as Schedule II controlled substances, the same category as oxycodone and fentanyl. This wasn’t always the case. Before October 2014, hydrocodone combination products were Schedule III, which meant easier prescribing with fewer restrictions. The DEA reclassified them after determining that their potential for abuse and dependence was comparable to oxycodone. In practical terms, this means prescriptions cannot be called in by phone in most states, refills require a new prescription, and there are stricter limits on how much can be dispensed at once.
Switching Between Brands or Generics
If you’ve been prescribed one and your pharmacy dispenses the other, or switches you to a generic, the medication is functionally the same. The hydrocodone component is identical, and the small variation in acetaminophen (300 vs. 325 mg) has no meaningful clinical difference. Inactive ingredients like binders and fillers can vary between manufacturers, which in rare cases affects how quickly a tablet dissolves or whether it causes minor stomach irritation, but the pain-relieving effect is the same.