http://english.pravda.ru/news/world/20-07-2006/83405-Implanon-0
Contraceptive under skin: long term solution of birth control
07/20/2006 11:22
Implanon sales will begin in August or later, after doctors receive
mandatory company training on how to implant it, according to manufacturer
Organon USA Inc. The company announced Tuesday that federal regulators had
approved it.
Once implanted, the matchstick-size rod should provide longer protection
than any other hormonal contraceptives now sold here. The list includes the
pill, patch, shot and vaginal ring.
It also will be the only implant currently available on the U.S. market
and the first since Norplant. Wyeth Pharmaceuticals stopped selling Norplant in
2000.
Unlike Norplant and its six tiny rods, Implanon includes a single rod,
just 1.5 inches long. Once injected under the skin of the upper arm, Implanon
provides 99 percent contraceptive protection for up to three years.
Norplant worked for up to seven years, or four years more than Implanon.
It also spawned lawsuits by women injured while having its six rods removed or
disturbed by side effects. Another implant, a two-rod product called Jadelle,
received Food and Drug Administration approval in 1996 but has never been sold
in this country.
Implanon has been sold in more than 30 countries since 1998. More than
2.5 million women have used it, according to Organon.
That track record, along with the implant's single-rod design and the
training doctors must receive before they can prescribe it to women, shouldn't
lead to a repeat of the Norplant experience, said Dr. Scott Monroe, acting
director of FDA's Division of Reproductive and Urologic Products.
The rod is inserted by a doctor in a quick surgical procedure that
requires only a local anesthetic. It must be removed after three years,
although it can be taken out at any time before then, according to the company,
a unit of Netherlands-based Akzo Nobel NV.
Implanon releases a low, steady dose of progestin to prevent pregnancy.
It may not work as well in women more than 30 percent heavier than their ideal
weight, Monroe said.
The implant also can cause irregular bleeding and spotting. For some
women, it can eliminate monthly periods altogether.
Progestin is a synthetic hormone that's similar to the progesterone made
in the ovaries. The hormone can thicken the mucus in a women's cervix,
preventing the union of sperm and egg. It also can prevent ovulation, or the
release of an egg from the ovaries.
Implanon and all other hormonal contraceptives are associated with an
increased risk of several serious side effects like blood clots. Smoking can
further increase those risks, the AP reports.
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