Implanon® (progestin implant)

What Is It?

Implanon® consists of one small flexible plastic tube filled with a synthetic progestin.  The capsule is inserted on the inner side of a woman’s upper arm.  The insertion may involve a minor surgical procedure.  Implanon® will provide highly effective contraception for up to 3 years.

How Does It Work?

Thickens cervical mucus, blocking sperm. Usually prevents ovulation. Prevents implantation of fertilized egg.

How Is It Used?

Six capsules are placed under the woman's skin on the inside of the upper arm. Capsules are inserted and removed by a clinician. Involves a minor surgical procedure using local anesthesia (numbing medicine).

How Well Does It Work?

Typical use: almost 100%. Perfect use: almost 100%. Effective immediately, if inserted within 7 days from the start of menstrual period. Effective for up to 5 years. Failure rate is high for women who take most seizure medications.

What Are Its Main Advantages?

Reversible as soon as it is removed. Long-lasting method. Nothing to remember. Does not interfere with sex. Can be used by women who cannot take estrogen. May decrease menstrual cramps, pain and blood loss. Can be used while breastfeeding.

What Are Some Possible Problems?

May have infection or pain in arm soon after insertion. Removal can be difficult. Some women have scarring at insertion site. Menstrual changes are common, including irregular bleeding, very light bleeding, heavy bleeding, missed periods or no periods. Side effects: weight gain, headaches, breast tenderness, hair loss, depression, ovarian cysts.