“…The only significant difference is the LNG-IUS doubles the incidence of moodiness. A systematic review has identified no differences in side-effects (acne, headaches, breast tenderness, nausea, prolonged bleeding, embedded device and pelvic inflammatory disease) between LNG-IUS and IUD 24 . Although serum levonorgestrel levels are low in LNG-IUD users (compared with oral or subdermal administration), wide inter-individual differences in systemic absorption of levonorgestrel occur 25 .…”