What do systematic reviews say?

Sedation vs placebo

Sedatives probably leads to lower vomiting ‐ intraoperative compared with placebo (moderate certainty).

• Interventions for preventing nausea and vomiting in women undergoing regional anaesthesia for caesarean section 2021 · Cochrane Headline outcomes only
  RR 0.35 [0.24, 0.52]
  8 studies · 593 participants
  Moderate