What do systematic reviews say?

Naproxen vs placebo

Naproxen showed no clear difference in need for additional analgesia (self‐recorded) compared with placebo (low certainty).

• Interventions to prevent or treat heavy menstrual bleeding or pain associated with intrauterine‐device use 2022 · Cochrane Headline outcomes only
  OR 0.29 [0.05, 1.8]
  1 study · 33 participants
  Low