What do systematic reviews say?

Corticosteroids vs placebo

It is very uncertain whether corticosteroids changes vomiting ‐ intraoperative compared with placebo (very low certainty).

• Interventions for preventing nausea and vomiting in women undergoing regional anaesthesia for caesarean section 2021 · Cochrane Headline outcomes only
  RR 0.52 [0.31, 0.87]
  6 studies · 609 participants
  Very low