Hi, I have a query regarding the norethisterone tablet my periods have never been regular,tried numerous pill and the depo drug which was the worst thin ive ever done. I had alot of cramps about a year ago and was checked out at the gum clinic and was all clear apart from I had PID I took the tablets went back for a follow up and was all good. since then my periods have been twise a month 7 days long which is getting me down and effecting my relationship. my doctor has given me 6 months worth of noretheristerone so take on day 12 to 26 twise a day from day. I do get slight cramps but nothing I cant handle but wonder if taking this drug will cause my Pid to flare up and ks it really safe to take these tablets long term.....