Intrauterine Contraceptive Devices

Intrauterine devices include Mirena, NovaT and FD-1.


Mirena is a hormone-releasing system placed in the uterus to prevent pregnancy. The success rate of this contraception is 99.9% because progesterone works directly on the endometrium. The endometrium becomes thinner thus the menstrual blood loss is reduced and the menstrual pain becomes tolerable.

Mirena is also expected to prevent the fertilized ovum to be implanted. It lasts for up to 5 years and the effect of this contraception continues.


Intrauterine Device(=IUD) is inserted into the uterus. These are the copper IUD and FD-1 which is made of plastic.

NovaT is the copper IUD that works by disrupting the sperm motility and damaging the sperm so that they are prevented from joining with an egg. Since the endometrium is influenced by IUD, the fertilized ovum is obstructed which results to unsuccessful implantation. NovaT may increase menstrual bleeding. Therefore, this contraception is not recommended to women who suffer from menorrhagia.

NovaT is highly effective in preventing fertilization, the success rate of this contraception is 99.4%.


FD-1 is also an IUD which is made of only plastic. It is less effective than others. It has been said that there were cases that the ring was already inserted but still the contraception failed. It is because the ring is made of a plastic IUD. The success rate of this contraception is 95%, so it is also recommended using condoms in case.

FD-1 is a better selection for those who suffer from menorrhagia. However, it is inferior compared to other contraception in preventing pregnancy so Mirena is highly recommended.

The intrauterine devices are useful to those women who have not experienced giving birth.

If you need to prevent pregnancy in long term, please feel free to set an appointment with us for consultation.

IUD is recommended to be inserted into the uterus during the menstruation period or within one week after the period ended or before the ovulation. It is not advised to insert an IUD after the pregnancy is confirmed.

Do not use Mirena if you have the following medical histories.
  • Had allergic reactions (difficulty breathing, hives, eczema, rash) after taking birth control pills or hormone pills in the past.
  • Been diagnosed or suspected of cancer down below[worsens the cancer]
  • Been suspected or diagnosed with luteal hormone dependent tumor[the tumor will worsen]
  • Irregular bleeding between periods[suspected of genital cancer. The bleeding caused by the genital cancer may get worse]
  • An abnormality of uterine shape and position in the past[difficult to place Mirena in the right position]
  • Diagnosed with genital infection(except candida)in the past [risk of PID may increase]
  • Diagnosed with STD (Chlamydia, Gonorrhea, AIDS, etc) and received treatment in the past 3 months[risk of PID may increase]
  • Currently treating cervicitis or vaginitis disease[may cause PID.]
  • Currently treating a pelvic inflammatory disease[the symptoms may get worse]
  • Had a miscarriage due to endometrium inflammation or endometrium infection in the past 3 months after the delivery[may cause endometrium inflammation.]
  • Had an ectopic pregnancy in the past[ectopic pregnancy may recur]
  • Experienced rashes, slow pulse, etc after placing Mirana or any type of IUD[it may lead to vagal reflex when Mirena is inserted or is removed]
  • Diagnosed with liver disorder (hepatitis, cirrhosis of the liver) or liver tumor[risk of the symptoms to worsen]
  • Currently pregnant or the possibility of being pregnant