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What is Opana er used for-Opana er is mainly used for pain relief. How long does Opana er last- It last at least 9 to 10 hours. How long does Opana er stay in your system- It last at least 5 to 6 hours in our system. These are some frequently asked questions. You can also buy from an online store to get some extra discounts like 30% off. Also home delivery and overnight delivery are available.





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