What do systematic reviews say?

Sedation vs placebo

It is very uncertain whether sedatives changes nausea ‐ postoperative 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 0.25 [0.09, 0.71]
  2 studies · 145 participants
  Very low