Pregnancy Bliss | Reproductive Health Answers
Implanon contains a synthetic progestogen called Etonogestrel. Implanon works similar to the mini-pill in that it inhibits ovulation. However, it is much more effective than the mini-pill. It also has the effect of thickening the cervical mucus thereby inhibiting sperm penetration. This effect is also seen with Mirena. In fact, Implanon is the most effective form of contraception with the lowest failure rate. Its failure rate is lower than that of a vasectomy at 1 in 10,000
Implanon is effective for three years. After that it must be removed. Ofcourse it can be removed before that if the woman so desires. The most unpredictable aspect of Implannon is the pattern of vaginal bleeding. Those who decide to stop using Implanon will usually do so because of irregular and sometimes heavy or prolonged vaginal bleeding. This affects about 1 in 10 of users. About 1 in 5 users will have no periods at all after a few months. Temporary problems at the site of insertion include pain, swelling or hematoma (blood clot) formation. This affects about 1 in every 30 users.
There is no evidence that Implanon affects body weight, mood or libido. Fertility resumes within days of removal of the device. Implanon should not be used where there is active liver disease, stroke or migraine with aura.
Its other advantage over the combined pill is that the dose of hormone released daily is actually lower at ethinyl estradiol 15mg/day (etonogestrel rate is 120µg/day). The estradiol level is actually half of what is delivered when using a monophasic pill such as Microgynon.
The NuvaRing is inserted by the user herself and vaginal muscles will keep it in place. A minority of users have experienced problems with it. Reported problems include
Ø Increased vaginal discharge (leucorrhoea)
Ø A sensation of vaginal inflammation (vaginitis)
Ø Foreign body sensation in the vagina
Ø Interference with sexual intercourse (partner awareness)
These unwanted effects are experienced by a minority of users (around 1 in 25). Use of NuvaRing does not cause change in body weight.
NuvaRing is sometimes expelled before it is due to be removed. This is usually associated with exertion such as in cases of constipation and the use of a tampon. However, in proper use, this should not really happen as the ring is supposed to have been removed at the time the period starts.
Despite the lower level of hormone delivered, there are fewer cases of irregular vaginal bleeding with NuvaRing compared to the combined pill. Efficacy of the ring is similar to the combined pill with a failure rate of around 0.8%.
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Last update: Jan 31, 2013