After having two children I wanted to have some thing as a contraceptive. My doctor advised me for Marina coil .First I wanted to get all the knowledge of Marina coil. Its effects and side effects as well. I found the Marina coil is T shaped and fits in the womb. The marina coil contains an contraceptive hormones . The hormone prevents the lining of womb to thickens. This way prevents ova cells to penetrate in the womb and mature or fertilised .
Apart from contraceptive it also helpful for females to control heavy periods, Migraine problem.
I also found (Which I have not experienced for my self) on research that if Marina coil is not fitted well or does not suit then might give very bad back pain or suffered from on and off bleeding. Leg swelling or depression kind of side effect. In this case consult your doctor and get it remove immediately.
Once fitted the Marina coil gives protection for four years.