How does an IUD work?

It is not fully known how IUDs work. However, nowadays it is assumed that the most probable effect is that it disrupts the normal function of the male gametes (sperm), which become incapable of fertilising the female egg. It is also assumed that copper ions influence the development of the egg so that fertilization doesn´t take place: IUDs are no longer considered a method of abortion.


When should an IUD be inserted?

Insertion is recommended during or shortly following menstruation. If pregnancy is excluded, Mona Lisa IUDs may be inserted at any time of the cycle. Postpartum insertion should be postponed until six weeks after delivery, as this is associated with high rates of perforation and expulsion. There are no doubts against breast feeding at lying IUD.


Are there interactions with other drugs?

The available experience indicates that, in general, drugs interfering with contraceptive efficacy of Mona Lisa IUDs are highly unlikely. However, published reports appear to show diminished efficacy in the presence of long-term use of non-steroidal anti-inflammatory drugs (especially acetylsalicylic acid) and corticoids. Short-term use in the treatment of dysmenorrhoea with not-steroidal anti-inflammatory drugs does not appear to reduce contraceptive efficacy.


When may Mona Lisa IUDs not be used?

Mona Lisa IUDs may not be used at:

  • Malignant diseases of the genital tract
  • Vaginal bleeding
  • Pregnancy
  • Past history of ectopic pregnancy or predisposing factors
  • infections of the genital tract
  • Sexually transmitted diseases during the last 12 months (except bacterial vaginitis, repeated herpes infection, hepatitis B)
  • Abortion with infection during the last 3 months, pelvic inflammatory disease (PID)
  • Uterine malformations (congenital or acquired)
  • Allergy to copper

Magnetic Resonanz Imaging (MRI) with an IUD in situ:

MR Conditional

Non-clinical testing has demonstrated that the Mona Lisa intrauterine devices are MR condition. A patient with a Mona Lisa intrauterine device can be safely scanned in a MR system with a static magnetic field up to 3 Tesla. 

The signed Declaration of the manufacturer is available under section "Quality System".



If you have any further questions regarding our medical devices, please do not hesitate to contact us.

Please send us an email to the following address: info@monalisa.eu