Materials, products and services - the Green Guide Online provides details of the life cycle environmental impacts of construction materials and components, and the Green Book is a free online database of products and services.
Spermicides are used globally for birth control, with or without condoms. As the only means of birth control, spermicides are rarely effective. However, in conjunction with condoms, spermicides are somewhat effective in birth control.
â¢ Inhibiting sperm from reaching or fertilizing your egg. â¢ Thinning the lining of your uterus. While thereâs no single explanation for how Mirena works, most likely, the above actions work together to prevent pregnancy for up to 5 years.Mirena does not protect against HIV or STDs.As soon as Mirena is placed in your uterus by your healthcare provider, it starts releasing small amounts of the hormone levonorgestrel into your uterus to provide continuous birth control for as long as you want, for up to 5 years. Inhibiting sperm from reaching or fertilizing your egg. â¢ Thinning the lining of your uterus. While thereâs no single explanation for how Mirena works, most likely, the above actions work together to prevent pregnancy for up to 5 years.