<prompt> Characteristic problem in females taking Norethisterone is :Irregular bleedingThromboembolismHirsutismWeight gain  <response>: Ans. is a i.e. Irregular bleeding Nor-ethisterone acetate is commonly used as an injectable steroid - NET-EN It is a progesterone based contraceptive like DMPA and its side effect are similar to those of DMPA. The most frequent side effect is irregular bleeding. NET-EN is given in doses of 200 mg at 2 monthly interval. Composition Features Lunellecyclofem 25mg DMPA 5mg estradiol cypionate Mesigyna 4g 50 mg NET-EN 5mg estradiol valerate ed - menstrual irregularities Rapidly reversible Monthly injection Inhibits lactation Rapid return of feility Monthly injection same as lunelle Extra Edge : Combined injectable contraceptive. 