This makes it hard for sperm to enter the uterus and reach any eggs that may have been released. The progestin also thins the lining of the uterus so that an egg will have a hard time attaching to the wall of the uterus. The birth control shot is an effective birth control method. Over the course of a year, about 6 out of typical couples who use the birth control shot will have an accidental pregnancy. The chance of getting pregnant increases if a girl waits longer than 3 months to get her next shot.
In general, how well each type of birth control method works depends on a lot of things. These include whether a person has any health conditions or is taking any medicines that might affect its use. It also depends on whether the method is convenient and whether the person remembers to use it correctly all of the time.
The birth control shot does not protect against STDs. In fact, some studies show that the birth control shot may possibly increase the risk of getting certain STDs, although scientists do not understand why. Couples having sex must always use condoms along with the shot to protect against STDs. Many girls who use the birth control shot will notice a change in their periods.
Side effects that some girls have include:. The U. Depo-Provera is given as an injection every three months. Depo-Provera typically suppresses ovulation, keeping your ovaries from releasing an egg.
It also thickens cervical mucus to keep sperm from reaching the egg. Medroxyprogesterone acetate is also available in a lower dosage. This version is called Depo-SubQ Provera Depo-Provera is used to prevent pregnancy and manage medical conditions related to your menstrual cycle. Your health care provider might recommend Depo-Provera if:. Depo-Provera isn't appropriate for everyone, however. Your health care provider might discourage use of Depo-Provera if you have:.
In addition, tell your health care provider if you have diabetes, uncontrolled high blood pressure or a history of heart disease or stroke, and unexplained vaginal bleeding. In a year of typical use, an estimated 6 out of people using Depo-Provera will get pregnant.
But the risk of pregnancy is much lower if you return every three months for your injection. Depo-SubQ Provera was highly effective in initial studies.
However, it's a newer medication, so current research may not reflect pregnancy rates in typical use. Depo-Provera doesn't protect against sexually transmitted infections.
In fact, some studies suggest that hormonal contraceptives such as Depo-Provera might increase your risk of chlamydia and HIV. It isn't known whether this association is due to the hormone or behavioral issues related to the use of reliable contraception. Using condoms will decrease your risk of a sexually transmitted infection. If you're concerned about HIV, talk with your health care provider. It might affect bone mineral density. This loss might be especially concerning in teens who haven't reached their peak bone mass.
And it's not clear whether this loss is reversible. Because of this, the U. Food and Drug Administration added strong warnings to the injection packaging cautioning that Depo-Provera and Depo-SubQ Provera shouldn't be used for longer than two years. The warning also states that using these products might increase the risk of osteoporosis and bone fractures later in life.
If you have other risk factors for osteoporosis, such as a family history of bone loss and certain eating disorders, it's a good idea to discuss the potential risks and benefits of this form of contraception with your doctor, as well as learn about other contraceptive options.
It should be noted that protective effects against cancer of the ovary and uterine lining are very likely. No ill effects on the developing baby have been shown to occur if Depo Provera is given when a woman is already pregnant or in the very rare case where a woman becomes pregnant despite the injection. Depo Provera can be used by most women who do not have any serious medical problems and by many women who use other forms of contraception.
It may also be suitable for women who cannot take the combined pill for medical reasons. Information about long acting reversilble contraception LARC , including contraceptive injections, is also available in Arabic, Chinese, Hindi and Vietnamese — see Downloads section on this page.
Long acting reversible contraception, such as intra uterine devices IUDs , contraceptive implants and contraceptive injections, may be the choice for you. If you're having sex and don't want to get pregnant, you need contraception.
Contraception is also called birth control or family planning. This fact sheet discusses your options. Women are encouraged to discuss their health needs with a health practitioner. If you have concerns about your health, you should seek advice from your health care provider or if you require urgent care you should go to the nearest Emergency Dept. How does Depo Provera work? How well does it work? Side effects During a normal menstrual cycle, your hormones cause the lining of your uterus to thicken in preparation for a pregnancy.
Other effects A small amount of weight gain sometimes occurs, although many women have no change and some lose weight.
Some women may be troubled by headaches, abdominal discomfort and mood changes. Some women have a reduced interest in sex, particularly women who are prone to depression.
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