Found a few boxs of these, my girlfriend says the docter give her them for period etc stuff, any of you guys know what this stuff dose, could it be used instead of nolva/clomid, or is this Norethisterone work back to front like clomid, thats what i was thinking, ie, clomid triggers prodution, norethisterone stops it or controls it

anyone know anything is this any use to my cycle for anti-e?