Yes, oxycodone is stronger than Vicodin. Milligram for milligram, oxycodone is about 1.5 times more potent than the hydrocodone found in Vicodin. That means 10 mg of oxycodone provides roughly the same pain relief as 15 mg of hydrocodone.
How the Potency Difference Is Measured
Doctors compare opioid strength using a standard called morphine milligram equivalents, or MME. Every opioid is assigned a conversion factor based on how it stacks up against morphine. Hydrocodone, the opioid in Vicodin, has a conversion factor of 1.0, meaning it’s essentially equal to morphine in strength. Oxycodone has a conversion factor of 1.5, making it 50% stronger per milligram.
This matters in practice because the doses prescribed reflect that gap. A standard Vicodin tablet contains 5 mg of hydrocodone paired with acetaminophen. Common oxycodone prescriptions also start at 5 mg, but that 5 mg delivers noticeably more pain relief than the same number on a Vicodin label.
What’s Actually in Each Pill
Vicodin is a combination drug: 5 mg of hydrocodone plus acetaminophen (the active ingredient in Tylenol). The acetaminophen works alongside the opioid to boost pain relief through a different mechanism. Oxycodone is prescribed both as a standalone drug and in combination products that also include acetaminophen (sold under the brand name Percocet). When people compare “oxy” to Vicodin, they’re usually comparing oxycodone in any form to the specific hydrocodone-acetaminophen combination.
Because Vicodin contains acetaminophen, there’s a ceiling on how much you can safely take in a day before risking liver damage. That built-in limit doesn’t apply to standalone oxycodone products, which is one reason oxycodone is more commonly used for moderate to severe pain where higher doses may be needed.
How They Feel Different
Both drugs share a long list of common side effects: nausea, vomiting, itching, and dizziness. The differences are subtle but real. Hydrocodone is more likely to cause fatigue and a general feeling of tiredness. Oxycodone tends to cause more constipation and drowsiness. For many people, these differences are minor enough that the choice between the two comes down to how well each one controls their specific pain.
The timeline of relief is also slightly different. Immediate-release oxycodone kicks in within 10 to 15 minutes and hits peak effect in about 30 to 60 minutes, with pain relief lasting 3 to 6 hours. Hydrocodone can take up to 30 minutes to start working, peaks around 60 minutes, and lasts a bit longer at 4 to 8 hours. So oxycodone hits faster and harder, while hydrocodone offers a somewhat longer window of relief per dose.
Risk and Scheduling
Both oxycodone and hydrocodone combination products like Vicodin are classified as Schedule II controlled substances by the DEA, the most restrictive category for drugs that have accepted medical use. This means both carry a high potential for abuse and physical dependence. The stronger potency of oxycodone doesn’t automatically make it “more dangerous” in a clinical setting, because doctors adjust the dose to account for that difference. But in real-world misuse, where people take more than prescribed or use pills without a prescription, the higher potency per milligram does raise the stakes.
CDC guidelines flag 50 MME per day as a threshold where risks begin to outweigh benefits for most patients. Because oxycodone’s conversion factor is 1.5, you reach that threshold faster. A patient taking 30 mg of oxycodone daily is already at 45 MME, while 30 mg of hydrocodone sits at 30 MME. This is one reason prescribers pay close attention to which opioid they choose and at what dose.
Why Your Body May Respond Differently
Both drugs are processed by liver enzymes, and genetic variation in those enzymes can change how effectively your body converts each drug into its active form. Some people are “poor metabolizers,” meaning they get less pain relief from a standard dose, while “ultra-rapid metabolizers” may experience stronger effects and more side effects than expected. This genetic variability is one reason two people can take the same pill and have very different experiences. If one opioid doesn’t work well for you, switching to the other sometimes makes a meaningful difference.
Stronger Doesn’t Always Mean Better
Higher potency sounds like an advantage, but pain management isn’t that simple. The goal is the lowest effective dose that controls pain without excessive side effects. For mild to moderate pain after a dental procedure or minor injury, Vicodin’s lower potency may be exactly right. For post-surgical pain or more severe conditions, oxycodone’s extra strength can be necessary. Prescribers weigh the type of pain, expected duration, your medical history, and how you’ve responded to pain medications before to choose between them. Neither drug is universally “better.” They occupy slightly different positions on the same spectrum.