A 27-year-old nulliparous woman requests reliable long-term contraception. Several times a year she has severe unilateral throbbing headaches that are preceded by 20 minutes of shimmering zigzag lines spreading across her left visual field. Her periods last eight days with flooding and clots, and recent blood tests showed haemoglobin 108 g/L (115-165) and ferritin 8 microg/L (30-200). Her blood pressure is 118/74 mmHg and her body mass index is 24 kg/m2. Which one of the following is the most appropriate contraceptive method for this woman?
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