If i take primoultn to postpone my periods,want to know if it is safe while taking rheumatoid medications celebrex, (celecoxib)prednison,sulfasalazi,methotrexate?

Don't do ...: if not absolutely necessary. PrimoultN is a progestin. I could not find any worrisome interactions between this medication and the ones you list. However, both Celebrex (celecoxib) and prednisone (a cortisone drug) might unfavorably affect the blood clotting system; progestins like PrimoultN might promote this. With taking these 4 significant meds, I would avoid anything not absolutely necessary. Best wishes