I am usually unable to keep the enema in beyond four or five hours, but it does seem my body expels it fairly forcefully so perhaps it is the nature of the medicine and our diseased colon combined that is to blame for the "explosive" phenonmonon. Also, I found that taking the Asacol and the enema daily was just too much and seemed to make my diarrhea worse. When I backed off on the enema a bit, as my doc suggested the diarrhea did improve.
As for that initial sensation that makes it hard to keep the enema in - I found two things helped. One was to angle the bottle exactly the way it is suggested in the instructions and the other is to insert the nozzle as far as it can go before squeezing any out.
UC diagnosed 10/05, first symptoms 1983
asacol 12/daily and rowasa as needed
Trying out Culturelle Probiotic
past rx: colozal, lialda, canasa
i can't complain, but sometimes i still do. lifes been good to me so far. -joe walsh