Intrauterine System

Intrauterine System

What is it?

• A T-shaped device that contains the hormone levonorgestrel (also called the “hormonal IUD”) and sits inside the uterus
• The hormone is released slowly over time and acts on the lining of the uterus
• The IUS can be left in place for up to 5 years
• Requires a prescription and has to be inserted by a physician (or health care provider)

How does it work?

• By preventing the sperm from fertilizing the egg
• Thickens the cervical mucus making it difficult for the sperm to get through
• Causes changes in the lining of the uterus
• In some women, it prevents the ovaries from releasing the egg

Effectiveness:

• The IUS is 99.9% effective

Advantages

• Extremely effective and long lasting (up to five years)
• Does not contain estrogen
• Does not interfere with intercourse
• Decreases menstrual cramping and bleeding
• May decrease endometriosis pain
• May decrease the risk of precancerous cells developing in the uterus
• 20 - 30% of women will stop having periods

Disadvantages

• Possible side effects after insertion include irregular bleeding or spotting
• Perforation of the uterus may occur at the time of insertion (but rare)
• May fall out or be expelled in up to 6% of women
• Does not protect against STIs
• A physician or nurse practitioner must insert and remove the IUS

Got Questions—Need Info:

Sexual Health Services

Algoma District (800) 726-0398
Blind River (888) 356-2551
Elliot Lake (888) 211-6749
Sault Ste. Marie (705) 541-7100
Wawa (888) 211-8074

www.sexualityandu.ca 

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