Also the downside would be, if you only inject it once a week, you can only adjust the dose once a week. If the dose is too high, or you exercise more on certain days, or if you lose weight, you're stuck with that dose and the hypos. Maybe this isn't a problem with Byetta but I suspect it would be because from what I read it increases production of/sensitivity to insulin. My viewpoint is biased by being type 1 on small insulin doses, but I'd be cautious unless you're the lucky one whose medication never needs adjusting, and you've already taken Byetta for some time without side-effects.