Opana and Opana ER is the chemical Oxymorphone a powerful semi-synthetic opioid analgesic that is derived from thebaine, and is approximately 3 times more potent than morphine. Thebaine is a chemical that is obtained from the Opium Poppy. It is a narcotic with the same modes of action as codeine, morphine, oxycodone, hydrocodone, fentanyl and tramadol. Its is avaiable as an immediate release tablet in the strengths of 5mg,10mg. It is also avaiable in an Extended Release form in the following strengths 5mg,10mg,20mg and 40mg respectively. This drug in tablet form was taken off the US market in the 1970's because of its misuse. It was still available in its injectable and suppository form. This drug is extremely addictive and should be taken only as and when prescribed.
Opana; Opana ER Oxymorphone.
I am not a pharmacist or a medical doctor of any kind. All of this information should be checked on your own if you have any doubts.