Miranda is 33 years old and presents to the GP requesting to switch her contraception from Microgynon to Mirena coil. She has never missed any tablets but she has completed her family and would prefer the convenience of not taking any daily medication. You discuss the Levonorgestrel intrauterine system and establish she has no contraindications to its use.
Which of the following statements is most correct with regards to switching from combined hormonal contraception to the Levonorgestrel intrauterine system?