Once inserted, the ring can be left in place for a maximum of three weeks. It is then removed for a week to allow for a withdrawal bleed.
One week after the ring is removed, a new ring is inserted.
The ring releases hormones similar to those found in the combined pill. The hormones are released slowly into the blood stream. The hormones in the ring prevent the egg from leaving the ovary.
Return to pre-existing fertility is likely to occur very quickly after ceasing to use the ring.