Difference Between Similar Terms and Objects

Difference Between IUD and Mirena

mother-baby-pdIUD vs Mirena

In order to ensure proper family planning, many couples have utilized a variety of different types of contraceptives in order to prevent the fertilization of the egg by the sperm during sexual intercourse. IUDs are one of the most favored types of birth control methods that are used by many women today. Compared to other types of birth control methods, IUDs are able to prevent 99% of pregnancies for longer periods of time. In many cases, women that use IUD are protected from 1 to 10 years.

The IUD is comprised of a soft, plastic frame that is inserted into the uterus in order to prevent the sperm from reaching the egg, as the IUD blocks the uterus. It also prevents the egg from attaching itself to the wall of the uterus in the event that fertilization does occur during sexual intercourse. In some cases, the IUD also has a thin lining of copper enveloping the plastic, making it a lot sturdier. With proper care in its insertion, an IUD can prevent pregnancies for up to ten years. In effect, the IUD works just as well as if a woman had a ligation operation, except, that in the case of the IUD, the woman can still get pregnant by simply removing the IUD device, and no surgery is required to insert the IUD.

The Mirena contraceptive system is very similar to the IUD, in that it comprises of a device that is inserted in the uterus to prevent fertilization of the egg, as well as the planting of the fertilized egg on the uterine wall in the event that fertilization does occur. One of the major differences between conventional IUDs and the Mirena contraceptive system, is that the Mirena also releases small dosages of a synthetic form of progesterone, called levonorgestrel, directly into the uterus. This hormone increases the effectiveness of the Mirena contraceptive system, because this causes a disruption in the menstrual cycle of the woman, preventing ovulation from taking place.

Another major difference between the Mirena contraceptive system and conventional IUD devices used, is their lifespan. While most IUD devices can last up to ten years, the Mirena contraceptive system only lasts for half of this time. This is mainly due to the fact that the hormones released into the uterus deplete, and will need to be replenished by inserting a new Mirena contraceptive device. Conceiving after using the Mirena system can also be more difficult than when using conventional IUD devices, because the woman’s reproductive system will need some time for it to return to its normal cycle.


1. Both the IUD and Mirena contraceptive systems involve the insertion of a device into the uterus to prevent sperm from coming in contact with the egg, as well as to prevent the fertilized egg from planting itself onto the uterine wall.

2. The Mirena also secrets small dosages of a synthetic progesterone into the uterus to further increase its ability to prevent pregnancy.

3. The IUD has a longer lifespan than the Mirena, as it can last up to ten years, compared to the Mirena which only has a lifespan of five years.

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