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The intrauterine system (IUS) and intrauterine device (IUD) are about the size of a quarter. IUCs are generally small T-shaped frames that are a little longer than an inch (about 3 cm) – or about the size of a quarter, with a lot less surface area!
99.4% effective with perfect use
99.2% effective with typical use
Replace as per product labeling (e.g. 3, 5 or 10 years, depending on brand)