LONDON (AP) - Hundreds of women in Britain have complained to the medical regulator after becoming pregnant despite using a contraceptive implant that is supposed to work for years.
But the implant's maker, Merck & Co., says the failure rate isn't exceptional, and that women should continue to use it.
Implanon contains synthetic progesterone and is inserted underneath the skin in the upper arm, where it is supposed to stop pregnancies for up to three years. More than 1 million implants have been sold since it was licensed in Britain in 1999.
The Medicines and Healthcare Products Regulatory Agency said it had received more than 1,500 complaints of side effects - including pain and scarring - linked to Implanon since 1999. More than 580 women reported they had suffered unplanned pregnancies.
Ronald Rogers, a spokesman for the New Jersey-based company, said the number of women in Britain who became pregnant were within the range the company would expect for that time period.