Xtampza ER, an extended-release form of oxycodone, stays in your system for roughly 1 to 3 days after your last dose, depending on whether you’re talking about active drug levels in your blood or what shows up on a urine test. The drug has an elimination half-life of about 5.6 hours, meaning it takes that long for half the oxycodone to clear from your bloodstream. For most people, the drug is functionally eliminated from the blood within about 30 hours.
How Quickly Xtampza Clears Your Blood
The elimination half-life of oxycodone from Xtampza ER is 5.6 hours when taken with food, which is notably longer than the 3.2 hours for immediate-release oxycodone. This slower clearance is by design: the extended-release formulation releases oxycodone gradually, with peak blood levels occurring about 4.5 hours after a dose.
A common rule of thumb is that a drug is essentially cleared from your blood after four to five half-lives. For Xtampza ER, that works out to roughly 22 to 28 hours after a single dose. If you’ve been taking it regularly, steady-state levels build up in your system within 24 to 36 hours of repeated dosing, so clearance after your final dose may take slightly longer than after a single dose.
How Long Oxycodone Shows on Drug Tests
Xtampza ER contains oxycodone, which is what drug tests look for. Detection windows vary by the type of test:
- Urine: Oxycodone from extended-release formulations is typically detectable for 1.5 to 3 days after your last dose. Urine tests pick up both oxycodone and its breakdown products, which linger longer than the active drug in your blood.
- Blood: Oxycodone generally clears from the blood within about 24 to 30 hours.
- Saliva: Detection is usually possible for 1 to 4 days, though this varies by test sensitivity.
- Hair: Like most opioids, oxycodone can be detected in hair for up to 90 days, though hair testing is uncommon outside of specialized screening.
Standard urine drug panels don’t always detect oxycodone reliably, because many use immunoassays designed for morphine-type opioids. If oxycodone detection matters, a specific oxycodone immunoassay or confirmatory testing is usually needed.
How Your Body Breaks Down Xtampza
Your liver does most of the work. Oxycodone is broken down primarily by a liver enzyme family called CYP3A4, which converts it into noroxycodone, an inactive byproduct. A smaller pathway involving CYP2D6 produces oxymorphone, which is pharmacologically active but present in very small amounts. These metabolites are then further processed and eventually excreted through the kidneys. About 9% of the oxycodone leaves your body unchanged in urine, with the rest exiting as various metabolites.
Food has a significant effect on how much oxycodone your body absorbs from Xtampza ER. A high-fat, high-calorie meal can increase peak blood levels by 100 to 150% and overall drug exposure by 50 to 60% compared to taking it on an empty stomach. This means a dose taken with a large meal puts more oxycodone into your system, which can modestly extend the time it takes to fully clear.
Factors That Slow Clearance
Several conditions can keep oxycodone in your system longer than the typical timeline.
Liver problems: In people with mild to moderate liver impairment, oxycodone blood levels run about 50% higher than normal, and overall drug exposure nearly doubles (95% increase). The elimination half-life increases by about 2.3 hours, pushing it close to 8 hours. That extends total clearance time to roughly 35 to 40 hours.
Kidney problems: Reduced kidney function (creatinine clearance below 60 mL/min) raises oxycodone blood levels by about 50% and extends the half-life by roughly 1 hour. Since the kidneys are the main exit route for oxycodone and its metabolites, impaired kidney function slows the entire process and can push urine detection windows beyond the typical 3-day mark.
Age: Older adults tend to have oxycodone blood levels about 15% higher than younger adults, likely due to age-related declines in liver and kidney function. The difference is modest but can contribute to slightly longer clearance times.
Other medications: Drugs that inhibit CYP3A4, the liver enzyme responsible for the primary breakdown pathway, can slow oxycodone metabolism significantly. Common examples include certain antifungals, some antibiotics, and grapefruit juice. Conversely, drugs that speed up CYP3A4 activity can shorten how long oxycodone stays in your system.
Body weight, hydration, metabolic rate, and how long you’ve been taking the medication also play a role. Someone who has used Xtampza ER daily for months will generally take longer to fully clear it than someone who took a single dose.