When switching from a contraceptive patch to an intrauterine device (IUD), you may experience differences in terms of side effects. The IUD contains a different type of hormone compared to the patch, which may result in a period of adjustment. Some possible side effects may be less with the IUD due to the absence of estrogen. It is recommended to use alternative protection initially when switching to the IUD. Overall, the IUD may provide a similar effect in reducing menstrual symptoms, and some women even experience a complete cessation of their period. It is difficult to predict individual reactions, but the first three months will give a good indication. There are also other contraceptive options available if the IUD does not suit your needs.