Yep, intranasal is the best ROA for the ERs. As long as they are the crushable, sniffable generics, and not the brand name octagons, that are about like OPs and are like plastic(from what I hear, haven't done opana in years, since they re-formulated the brand names) they are fucking so strong! ER opana up the nose is like one of the best feelings I have ever felt, absolutely incredible! Your good at 20mg or less dude, if you do 100+mg of oxycodone usually.. Should me more than good, if I were you I would just sniff it in halves, or even quarters and stretch the pill out longer.. that's what I used to do with the old brand name 40s, the yellow stop signs.. those were fucking epic! But I really, REALLY enjoyed the opana IR 10mgs, done IV.. That was just out of this world feeling, the best feeling you can possibly feel, but I don't and never will recommend to anyone, to ever start IVing pills.. its a very addicting, bad, harmful routine to get into, your way better of intranasal.. Opana SUCKS when taken orally, don't ever bother, they have such a low oral BA something like 10-20%BA taken orally(I think?).