Based on the information available, there can be a copay difference for generic vs original OxyContin. The cost of prescription medications can vary based on several factors, including the type of insurance coverage, the pharmacy, and the availability of generic alternatives [1].

OxyContin, a brand-name medication, is a strong prescription pain reliever [2]. Its active ingredient is oxycodone, which is also available in generic forms [2]. When a drug like OxyContin has an expired patent, other manufacturers can produce and sell generic versions of the drug [1]. These generic versions typically cost less than the brand-name medication [1].

According to DrugPatentWatch.com, the patent for OxyContin expired in 2013 [3]. After this, generic versions of oxycodone entered the market, which could lead to a difference in copay for patients. However, the exact amount of the difference can vary based on several factors, including the patient's insurance plan and the specific pharmacy [1].

In conclusion, there can be a copay difference for generic vs original OxyContin due to the availability of generic oxycodone after the patent expiration of OxyContin. Patients are encouraged to check with their insurance providers and pharmacies for specific cost information.

Sources:
[1] "Prescription Drugs: How to Save Money." Mayo Clinic. <https://www.mayoclinic.org/diseases-conditions/drug-costs/in-depth/prescription-drugs/art-20048041>.
[2] "OxyContin: Uses, Dosage & Side Effects." RxList. <https://www.rxlist.com/oxycontin-drug.htm>.
[3] "OxyContin (oxycodone hydrochloride)." DrugPatentWatch. <https://www.drugpatentwatch.com/drugs/oxycontin>.