Back pumps seem somewhat common when taking dbol. I'm taking 30mg a day right now and I havn't really experienced much back pain. I can't remember which thread it was, but someone suggested that taurine (i think) helps keep the back pumps at bay. I can't remember what dosage- but it equated to the amount thats in two energy drinks a day. I have one every day and havn't had any real issues.