Isoniazid suna ne da ke nufin maganin da ake amfani da shi wajen maganin tarin fuka. Kwayoyin rigakafi ne da ke aiki ta hanyar hana girma da yawa na ƙwayoyin cuta masu haifar da tarin fuka. Ana amfani da Isoniazid tare da sauran magunguna don magance cutar tarin fuka, kuma ana iya amfani da shi don rigakafin cutar tarin fuka ga mutanen da suka kamu da cutar amma har yanzu basu kamu da cutar tarin fuka ba.