Effectiveness
Like other hormonal methods, the injection is highly effective; it is 99.7% effective for preventing pregnancy.
Side Effects
In addition to the more commonly reported side effects such as irregular bleeding and weight gain, some health risks are associated with the use of contraceptive injections. Some women may have allergic reactions with serious consequences. This method is not recommended for women who are concerned about weight gain, have liver disease, gallbladder disease, or a history of depression.
Women who use injections may face an increased risk of osteoporosis (weakening of the bones) and are advised to exercise and take plenty of calcium and vitamin D. Some studies show that bone density is restored once a woman stops using this method.
How It Works
The injection stops the ovaries from releasing eggs. It thickens the cervical mucus and changes the uterine lining, making it harder for the sperm to enter or survive in the uterus. These changes prevent fertilization.
This method may not be recommended for women who are planning to become pregnant in the near future because if they do become pregnant while using this method, there may be an increased risk of premature birth.
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