Having a Mirena Coil with Tibolone does sound like an unusual combination. I was told that Tibolone can be very effective for libido but if it has not done anything for you, then you might want to change. If you are lucky enough to be able to tolerate synthetic progestins, then the Mirena could be a good option for you but I would agree with Dancinggirl and suggest that the oestrogel might be worth a try rather than continuing with the Tibolone. If you can get the oestrogel dose right, I would assume two pumps per day, you might well find that you never get periods when using it with the Mirena. Also, you would not have to worry about the womb lining building up because the Mirena would force it to shed when necessary.