Norplant

Side Effects
irregular menstrual periods for the first approximately three months
periods lasting longer than normal
bleeding or spotting between periods
heavy bleeding
going with no period for the mentioned period of time

Common Side Effects
Weight Gain
Nervousness
Anxiety
Nausea
Vomiting
Breast Pain
Dizziness
Dermatitis/rash
Excessive Hairiness in women
Scalp-hair loss
Headach
Depression
and Acne

Sometimes pain, itching or infection at the site of the implant will occur.
Ovarian cysts may also occur, but usually do not require treatment, although they can cause paineven if benign. (non-cancerous)