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Intra Uterine Device (IUD)/Intra Uterine System

Intra uterine meaning within the uterus.
An IUD is a specially shaped piece of plastic wrapped in copper and inserted in the uterus by a doctor.

An IUS (Mirena by Bayer)is also a specially shaped plastic IUD which releases a hormone similar to progesterone that is inserted into the uterus by a doctor.
Mirena is also used to treat heavy menstrual bleeding.
IUD/IUS are fully reversible form of birth control.


  • Once inserted by the doctor, the IUD/IUS reduces the chance of the egg and sperm fertilizing. If it does come together, the IUD also changes the lining of the uterus so the fertilized egg does not implant
  • The Mirena also thickens the cervical mucous to decrease the sperm’s motility
  • Once in place, the IUD/IUS can stay in place for up to 5 years
  • You must check the threads of the IUD/IUS after each menstrual period or about once a month to be sure the IUD/IUS is still in place
  • IUD/IUS are removed by a doctor


95%- 99%

Average Cost

IUD $80.00-$160.00
IUS (Mirena) costs $325-$360, it also covered under the Ontario Drug Benefit Program

IUD and IUS are not available at the health unit


  • Effective method of birth control for women in a monogamous relationship
  • Long term birth control method, good for up to 5 years
  • Can’t be felt during sex
  • Recommended for breastfeeding women


  • Generally used for women who have had children and in a monogamous relationship
  • Not recommended for women with multiple sex partners
  • Needs medical exam and doctor’s prescription
  • Can be uncomfortable to insert
  • Needs to be inserted by a doctor
  • May cause heavier cramps and bleeding first month after insertion
  • Need to feel regularly for threads to check placement
  • Doesn’t protect against STI/HIV
  • May sometimes result in pelvic inflammatory disease (PID)

[ other forms of birth control ]

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