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Do you mean oxycodone? The one most similar would be hydrocodone and it's probably the most widely prescribed in the U.S. as it's only a schedule III narcotic. Hydromorphone, Oxymorphone and even Codeine is more rare to find although if you went to a doctor they would probably have no qualms about giving you codeine over hydrocodone (Vicodin).
Oxycodone (Percocet) and Hydrocodone (Vicodin) are more energetic opioids and less sedative, I think, compared to the others out there. Be careful with any opiate/opioid you choose to use.
I'd have to agree with David. In the opiate family, Hydrocodone is the twin brother (not identical twins, mind you!) of Oxycodone. The rest of their brothers and sisters are even more different than the two of them.
However if you've done Oxycodone too much, there's not really much use going back to those vikes, as much of the euphoria would have disappeared by now...