I'm fairly experienced with morphine and dosing it. I do not IV or plug it. taking half of a n100 and waiting about another hour and taking the other half will produce and give me a satisfying lingering buzz that stays with me for hours... less euphoria compared to oxycodone but to me the fact that it lasts so long and lingers in my neck and spine is a deal breaker... anyways I've recently came into possession of Opana ER 20 mg's and I'm wondering about the potency and the dosage. do any of you have experience with Opana ER? is it similar to morphine in strength? I was thinking about taking half of the 20 mg opana to start and work from there... I have a moderately high opioid tolerance, hydrocodone's don't even get me high anymore... what are your thoughts any suggestions or information is much appreciated. thanks