Norethisterone is a synthetic form of the hormone progesterone, commonly used in various hormonal contraceptives and treatments for menstrual disorders. It helps regulate the menstrual cycle and can be prescribed to manage conditions like endometriosis and heavy menstrual bleeding. This medication works by altering the lining of the uterus and preventing ovulation. Norethisterone is available in tablet form and is typically taken for a specific duration, depending on the condition being treated. As with any medication, it is important to follow a healthcare provider's instructions and be aware of potential side effects.