What should you know about ethinylestradiol norethisterone acetate?

Ethinylestradiol supplies estrogen activity, while norethisterone acetate supplies progestogen activity. In a combined contraceptive, their effects can stop ovulation and alter cervical mucus and the uterine lining. Depending on the formulation, clinicians may use the combination for contraception or to organise menstrual bleeding. The prescription name and schedule matter, so do not substitute a different strength or brand without checking.

Review your health history before starting, including migraine with aura, smoking, high blood pressure, previous blood clots, liver disease, and upcoming operations. Mention every medicine and supplement. Take each dose as directed and use the pack instructions for a late or missed dose. Ask what backup contraception is needed after a missed dose or an interaction. This medicine does not prevent sexually transmitted infections.

Emergency assessment is needed for chest pain, difficulty breathing, coughing blood, a painful swollen leg, sudden weakness, or a severe headache accompanied by visual or speech changes. Contact your clinician promptly for severe abdominal pain, jaundice, persistent heavy bleeding, or possible pregnancy. New symptoms should be assessed on their own merits rather than used to guess the cause.

Ask how the prescribed schedule differs from other combined pills, when protection begins, and what to do if you vomit after a dose. Discuss whether the [Combined Pill](/treatments/contraception-and-family-planning/combined-pill/) is suitable and review the estrogen ingredient, [Ethinylestradiol](/materials/ethinylestradiol/).