Understanding a Contraceptive Injection  Contraceptive
injections are perfect for women who have trouble remembering to
take birth control pills or who do not want to have think about
birth control options at all. You only have to get the injection
once every 11 weeks, and besides that, you don't have to think
about it again. It is very effective at preventing pregnancy and
is relatively convenient.  A contraceptive injection is a shot
you receive once every 11 weeks to prevent pregnancy. The
injection supplies a cocktail of hormones that suppress
ovulation and changes your cervical mucus such that it will
resist the penetration of sperm. It has a 99% effectiveness rate
and is not affected by the use of antibiotics (most oral
contraceptives are rendered ineffective by antibiotics, so this
is a perfect method of contraception for those who are on long
term antibiotics).  In essence, the contraceptive injection
fools your body into thinking it is pregnant, causing you to
possibly take on some of the common symp