Percocet is stronger than Vicodin on a milligram-for-milligram basis. Percocet contains oxycodone, which is about 1.5 times more potent than the hydrocodone found in Vicodin. But in practice, when both drugs are prescribed at equivalent doses for the same type of pain, clinical trials show they provide nearly identical relief.
Why Percocet Is Technically More Potent
The difference comes down to the opioid ingredient in each pill. Percocet’s active opioid is oxycodone, while Vicodin’s is hydrocodone. Using a standard conversion scale called morphine milligram equivalents, 1 mg of oxycodone equals 1.5 mg of morphine, while 1 mg of hydrocodone equals just 1 mg of morphine. That means oxycodone delivers 50% more pain-blocking power per milligram than hydrocodone.
Both medications also contain acetaminophen (the same ingredient in Tylenol), typically 325 mg per tablet. The opioid component comes in matching strength options: 2.5 mg, 5 mg, 7.5 mg, or 10 mg for both drugs. So a 5 mg Percocet tablet is mathematically equivalent to about 7.5 mg of Vicodin in terms of opioid potency.
In Clinical Trials, They Perform the Same
A randomized trial published through the American Academy of Family Physicians tested this head-to-head. Researchers gave 240 adults with acute musculoskeletal pain (including fractures) either oxycodone/acetaminophen 5 mg/325 mg or hydrocodone/acetaminophen 5 mg/325 mg for three days. The result: no significant difference in pain score reduction between the two groups. About 60% of patients in both groups reported at least a 50% decrease in their pain. The study was specifically designed to detect a meaningful clinical difference, and it didn’t find one.
This makes sense when you consider how these drugs are prescribed. Doctors don’t give everyone the same milligram dose of each. They adjust the prescription based on the drug’s known potency. So while Percocet is stronger per milligram, your actual prescription is calibrated to deliver similar pain relief regardless of which one you receive.
How They Feel and How Long They Last
Both drugs kick in quickly, within 10 to 30 minutes of taking a dose. After that, the timelines diverge slightly. Hydrocodone (Vicodin) tends to peak within 30 minutes to an hour and lasts 4 to 6 hours. Oxycodone (Percocet) peaks a bit later, around 1 to 2 hours, but wears off sooner, typically lasting 3 to 4 hours.
In practical terms, this means Vicodin may provide a longer window of relief per dose, while Percocet hits its maximum strength a little later. For someone managing pain through the night, that difference in duration could matter. For short-term daytime pain, most people won’t notice a meaningful difference in how the two feel.
Side Effects Are Similar
Because both drugs work through the same mechanism in the brain, they share the same core side effects: nausea, drowsiness, constipation, and dizziness. Neither drug has a clearly better or worse side effect profile overall. Some individuals tolerate one better than the other, but that varies from person to person rather than following a predictable pattern. Both carry the same high risk of dependence with long-term use.
The acetaminophen component in both drugs creates an important safety ceiling. The FDA sets the maximum daily acetaminophen intake at 4,000 mg across all medications you’re taking. Since each tablet of either drug contains 325 mg, that limits how many pills you can safely take per day, especially if you’re also using any over-the-counter products that contain acetaminophen (like Tylenol, NyQuil, or Excedrin). Taking too much acetaminophen can cause serious liver damage.
Both Are Schedule II Controlled Substances
Percocet has always been classified as a Schedule II controlled substance, the most restrictive category for drugs with accepted medical use. Vicodin used to be Schedule III, which meant easier prescribing with phone-in refills. That changed in October 2014, when the DEA reclassified all hydrocodone combination products to Schedule II. Today, both drugs carry the same legal restrictions: no refills, a new written prescription required each time, and tighter monitoring from prescribers.
Which One You’ll Be Prescribed
Both Percocet and Vicodin are used for moderate to severe pain from surgery, injuries, or certain chronic conditions. No major medical guideline recommends one over the other for a specific type of pain. In practice, the choice often comes down to your doctor’s clinical experience, your history with either drug, and how your body responds. If you’ve tried one and experienced bothersome side effects, switching to the other is a reasonable conversation to have, since individual responses to opioids vary even when the drugs are closely related.
The bottom line: Percocet is the stronger drug by pharmacology, delivering 50% more potency per milligram. But when prescribed appropriately, both provide equivalent pain relief for most people. The real differences are in duration (Vicodin lasts a bit longer per dose) and individual tolerance, not in one being dramatically more effective than the other.