WAbortifacient
WAglepristone
WApiol
WApiole
WAristolochia
WCantharidin
WCaulophyllum thalictroides
WClaviceps purpurea
WCotton
WDiachylon
WEcballium
WErgot
WGemeprost
WHypericum perforatum
WLapacho
WLilopristone
WLotrifen
WMentha pulegium
WMetapristone
WMifepristone
WMisoprostol
WMugwort
WNisterime acetate
WOnapristone
WPotassium permanganate
WPrimodos
WProstaglandin E2
WProstaglandin F2alpha
WRuta graveolens
WSilphium
WSpanish fly
WTansy