The Norplant method is six small flexible rods filled with a hormone that are placed just under the skin on the inside of your upper arm. They prevent pregnancy by slowly releasing the hormone which has several effects:

• The release of an egg is prevented.
• The cervical mucous becomes hostile to the passage of sperm.
• The lining of the uterus becomes unfavorable to the attachment of a fertilized egg.

Advantages include:

• 99.7% effectiveness
• One insertion and you don't have to think about birth control for five years.
• Independent of partner cooperation.
• Menstrual bleeding is usually less.

Disadvantages include:

• High initial cost (up to $500).
• Irregular bleeding is common especially in the first six months of use.
• If you raise your arm, the implants may be noticeable.
• Removal is much harder than insertion.
• No prevention from sexually transmitted diseases.