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| USA IUD comparison | ||
|---|---|---|
| ParaGard | ||
| ≤10 years. | Copper toxic to sperm. | Heavier menses. |
| Mirena | ||
| ≤5 years. | Progestin thickens cervical mucus, blocks sperm. | Lighter or no menses. |
| Skyla | ||
| ≤3 years. | Progestin thickens cervical mucus, blocks sperm. | Lighter or no menses. |
