Effect of norethisterone dose and duration in the management of abnormal uterine bleeding: a narrative review and case report.

Abnormal uterine bleeding (AUB) is an acute/chronic variation in the normal menstrual cycle that affects adolescents, women of reproductive age and perimenopausal women. AUB affects approximately 3-30% of reproductive-aged women worldwide, and reduces their quality of life and productivity whilst increasing the overall healthcare burden. Its management requires thorough medical evaluation and individualized treatment. Depending on the severity and cause of AUB, its treatment ranges from lifestyle modifications and hormonal therapies to more invasive procedures or surgery. Although hormonal therapy is the preferred first-line measure in AUB, the available pharmacological options have various adverse effects. There exists a need for safer and more efficient treatment regimens with high patient compliance to effectively treat AUB. Norethisterone, also known as norethindrone, is a widely used synthetic analogue of progestogen. Controlled release formulations of norethisterone/ norethisterone acetate help maintain constant drug levels in the blood and exert minimal side-effects; therefore, they are promising therapeutic agents for effective AUB management. The present review summarizes the epidemiology and diagnosis of AUB, with a focus on the safety, efficacy and tolerability of norethisterone/ norethisterone acetate in AUB management. We also report a case of AUB in a 40-year-old woman, who was treated with NETA tablets. The treatment resulted in favourable outcomes, and patient satisfaction.