Hi Stute
I can give you a very brief rundown. I'll probably repeat the stuff in Steff's research (hopefully). Byetta's not an insulin, it's a drug that both gets your pancreas to release more insulin and helps your body use it more effectively (i think, i've packed all my notes...grrrr). Are you taking it with your insulin? Or instead of?
You inject it, twice daily, subcutaneously like insulin. You'll probably start off on a 5mcg dose for a month and then step up to 10mcg. It's also supposed to be an aid to wieght loss (but you've lost 5 stone already...i wish i could do that 🙂). You take it with meals.
The problems are the side effects, the reason you up the dose after a month is to try to minimise them, they tend in cause nausea, bloating and diahorrea, which some people can't tollerate. Saying that some people have no problems at all.
There's also a related, newer drug called Liraglutide/Victoza, a once daily injection, which is similar but has fewer side effects and hypos (they say) and helps reduce blood pressure and improves beta cell function.This info all comes from the company that makes the stuff and is trying to sell it, so your mileage may vary. It's probably not liscenced yet as an add on to insulin though.
Hope that helps
Rachel