Yes meds can go into the peg tube,but fentanyl delivers a regular level of medication 24/7,keeping pain under control,and oral morphine is then added for breakthrough pain.i dont know why anyone would tell you they dont use fentanyl much any more,as it is and was a life saver for many many people here.why have to wait for the pain to get unbearable and then wait 20 mins for meds to kick in,when you can be comfortable most of the time?