Side-by-Side
OxyContin vs Fentanyl: Key Differences
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OxyContin
oxycodone extended-release
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Fentanyl
fentanyl
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| Drug Class | Opioid (Schedule II) | Opioid (Schedule II) — synthetic, ultra-potent |
| Half-life | 4.5 hours (12-hr effect with ER) | 2–4 hours (patch: 17–27 hours) |
| Primary Use | Severe chronic pain requiring around-the-clock opioid therapy | Severe chronic pain (patch), breakthrough cancer pain (lozenge/film) |
| ⬛ Black Box Warning | Addiction, abuse, misuse, overdose, and death. Extended-release formulation carries additional risk — crushing or chewing bypasses controlled release and delivers a potentially fatal dose immediately. | All standard opioid risks plus extreme potency risk. Fentanyl patches can be fatal if used incorrectly, cut, or accessed by non-tolerant individuals. Illicitly manufactured fentanyl is the leading driver of US overdose deaths. |
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Common Questions
OxyContin vs Fentanyl FAQ
Fentanyl is approximately 10 times more potent than oxycodone (OxyContin's active ingredient) by weight, and 50–100 times more potent than morphine. A dose of 2 milligrams of fentanyl can be lethal to a non-tolerant person — roughly the weight of a few grains of salt. The narrow margin between an effective dose and a deadly dose makes fentanyl significantly more dangerous in terms of accidental overdose risk.
Prescription fentanyl is manufactured under strict controls in known concentrations — patients and physicians know exactly what dose is being administered. Illicitly manufactured fentanyl (IMF) has no dosing consistency. A counterfeit pill or powder can contain wildly varying amounts of fentanyl, and even a tiny amount more than expected can cause respiratory arrest within minutes. The DEA has documented counterfeit pills ranging from 0.02mg to over 5mg of fentanyl per pill — a more than 250-fold variation.
Combining two opioids is uncommon and carries significant risk. In some cancer pain regimens, a long-acting opioid (like OxyContin) is paired with a short-acting fentanyl product for breakthrough pain — but this requires careful management by a pain specialist. For most patients, using both simultaneously multiplies the risk of respiratory depression. Always confirm your prescriber has reviewed your full medication list and understands the combined respiratory risk.
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Medical Disclaimer: PillScope provides educational information only. This page is not medical advice. Do not stop or change any medication without consulting your doctor or pharmacist. FDA adverse event data reflects voluntary reports and does not establish that a drug caused a specific outcome.