I use these. Enemas are nothing to be afraid of. However, as Red said, when you are in a flare up, the enemas can be difficult to retain in those first few minutes after putting it in. On the other hand, you may not experience any discomfort. If you do, try your best to get through it. If you have to let it go, don't worry about it. Try again, usually if that happens the second one is easier.
Oh, and there are normally no side effects to using hydrocort enemas. You would have to use them for a very long time for there to be a concern. In my experience, these enemas are usually prescribed for 2-4 weeks.
Good luck with them, you'll get used to putting stuff up your butt! And they work too.
43 Year Old Male,
First flare up in 1998, dx 2001
Current Meds: 6MP, Uceris
Past Meds: Asacol, Hydrocort enemas, LDN, Uceris, Lialda, Canasa, Rowasa (stopped all mesalamine 10/24/13), Prednisone.
Supplements include: Fish Oil, Psyllium, Bosswellia, Turmeric, Vitamins D, DHEA