Ma'anar ƙamus na kalmar "anticoagulant" wani abu ne ko magani wanda ke hana ko rage daskarewar jini. Ana amfani da magungunan kashe qwari don magance ko hana yanayi irin su thrombosis mai zurfi (DVT), embolism na huhu (PE), da bugun jini. Suna aiki ne ta hanyar yin katsalandan ga abubuwan da ke tattare da jini a cikin jini, wanda ke hana samuwar jini wanda zai iya toshe hanyoyin jini kuma yana haifar da mummunar matsalar lafiya. Misalan magungunan rigakafin jini sun haɗa da warfarin, heparin, da dabigatran.