What the packet says
What is it?
What's it made of?
Kyleena is made of a small white T-shaped frame made from a plastic called polyethylene. The hormone is contained within a silicone substance called polydimethylsiloxane and colloidial silica. A ring composed of 99% pure silver is located at the top of the vertical stem close to the horizontal arms and is visible by ultrasound. The T-shaped frame also contains barium sulphate so that it can be seen on X-rays. There are two fine threads, made of polypropylene, <0.5% phthalocyaninato(2-) and copper phtalocyanine blue, attached to the bottom of the frame
How it works
The Hormonal coil is a small, T-shaped plastic device that is inserted into your womb by a doctor or nurse. It releases the hormone progestogen gradually into your womb which prevents pregnancy by making the fluid in your cervix thicker (which makes it more difficult for sperm to enter the womb), and preventing the lining of your womb thickening enough for an embryo to grow in it. Sometimes it can also stop you ovulating.