How can dexibuprofen affect amniotic fluid from the 20th week of pregnancy onward?

From pregnancy week 20 onward, dexibuprofen may cause oligohydramnios through foetal renal dysfunction shortly after treatment starts, usually reversible upon discontinuation; antenatal monitoring should be considered after several days of exposure, and dexibuprofen should be stopped if oligohydramnios is found.