Hi, I would like to know if it is safe to take Duromine (Phentermine) while im taking Norethisterone to delay my period? Are there any drug interactions or counteractions? The Norethisterone was prescribed for me for 13 days begining 23rd April to delay my period for a holiday. The Duromine was just prescribed to me for a weight loss program. Is it safe to take these together, and are there any effects i should know about?