ius (mirena)

Reliability
Over 99% effective.
One woman in 100 will get pregnant a year.

How it works
A small plastic T-shaped device, which releases the hormone progestogen, is placed in the womb and prevents the sperm reaching an egg. It also prevents an egg settling in the womb (implantation).

Possible Side Effects

• May have irregular bleeding and some pain in first few weeks / months
• May fall out
• Partner may feel threads during intercourse
• Breast tenderness, acne, nausea, weight gain, headaches in first two months
• Infection
• Ectopic pregnancy if IUS fails

Advantages / Benefits

• Reliable
• Lasts five years
• No need to remember contraception
• Fertility returns immediately once removed
• Periods lighter and shorter
• Some protection against pelvic infections

Suitability

• Less suitable for those at risk of pelvic infection (e.g. those who have multiple sexual partners)
• Less suitable for young people without children
• Less suitable for those with a previous ectopic pregnancy
• Very suitable for women with heavy, painful periods
• Good alternative to sterilisation

Who can provide it?
Trained Doctor ONLY at Family Planning Services or GP

Comments
Require screening for chlamydia before insertion.
It is put in during Day 1-7 of menstrual cycle (day 1 = first day of bleeding).
Women are taught to feel threads in vagina.
May be used as part of HRT.