Hi KT,
Don't know much about those two drugs as I'm on Doxil for ovarian ca. I have recently been given steroids though. They are given for a variety of reasons, mostly for side affects of the chemo. In my case, I get it for the blisters and rash that developed all over my body after I got the 3rd Doxil treatment. If you do receive steroids, it is most efficacious to get them at the same time as the chemo. If you wait until a week later, like I did once, they didn't work at all.
But steriods, like all other meds have their problems too. They can cause your stomach lining to be irritated and thus more nausea and vomiting. Also they can cause insomnia, mood swings and what is sometimes called "steroid psycosis"
You really have to weigh the benefit against the detriment. Since they really help me live for the next 4 weeks after my treatment, I put up with the stomach and psych. side affects--these seem to last for about 3-4 days afterwards. On the brighter side of things, steroids give me energy and I get up early in the AM, so that is a good thing. They do tend to make me more emotional though.
Hope that helps!
Blessings and love to you and yours