Is hydromorphone the same as oxycodone?

Are hydromorphone and oxycodone the same drug?

No. Hydromorphone and oxycodone are different medications. They are both opioid pain medicines, but they have different chemical structures and different dosing/strength conventions.[1][2]

How do they differ if both are “opioids”?

• Hydromorphone is sold under names such as Dilaudid and is a different opioid than oxycodone.[1]
  
• Oxycodone is sold under names such as OxyContin (extended-release) and Percocet (often combined with acetaminophen).[2]
  
  Even though both can treat moderate to severe pain, they are not interchangeable without clinician guidance because the dose needed to achieve pain control can differ and opioid effects can also differ by formulation (immediate-release vs extended-release).
  
  

Are they ever used together or substituted?

They may be used for pain treatment in the same clinical context, but switching between them is not a simple “same as” substitution. Clinicians dose-convert between opioids based on the patient’s prior opioid exposure and the specific product/formulation.

What matters most for patients: dose forms and equivalents

The biggest practical issue is that both drugs come in different forms (for example, immediate-release vs extended-release). Correct dosing depends on the exact product and the patient’s opioid history, not just the name of the opioid.

Can you compare them on a single strength scale?

Not directly. Because they are different opioids, “mg for mg” is not the same. If a prescription change is being considered, the prescriber/pharmacist will use conversion guidance and consider formulation and patient factors.

Sources:
1. https://www.drugs.com/mtm/hydromorphone.html
2. https://www.drugs.com/mtm/oxycodone.html