Short answer: nothe half-life is ~1 week regardless of whether youre on 0.25 mg, 0.5 mg, or higher
If you notice that early dosing, which was previously well-tolerated, starts producing nausea after significant weight loss, the changing pharmacokinetics of your lighter body may be the explanation
However, those who eat large, high-fat meals in the first days after starting treatment, or who consume alcohol, are more likely to experience significant nausea in the first week
Fluid needs depend on your activity level, sex, and environment, among other factors
And pay attention to how your body responds because your tolerance may be significantly lower than it was before starting semaglutide