Side effects of the birth are similar to side effects associated with other forms of birth control. However, one side effect may cause concern for women who have a history of osteoporosis in their family. You should discuss birth control options with your doctor to figure out if the birth control shot is right for you.
Time Frame
The birth control shot is in your body for about 13 weeks and some side effects can last that long. Other side effects may appear following a few shots.
Bone Density Loss
You may experience bone density loss if you use the birth control shot for a long time. This can result in weaker bones and increases the odds of breaking a bone. Your doctor should test your bone density if you are on the birth control shot for a year or more.
Changes to Menstruation
Spotting between periods, irregular periods or a complete absence of your period may occur while on the birth control shot. You may also experience daily bleeding when you first start the shot, although this is uncommon.
Bloating and Weight Gain
Bloating, weight gain and water retention are side effects associated with the birth control shot. Your doctor can review your diet and salt intake to help lessen the severity of these side effects.
Other Side Effects
Other side effects include mood swings, headache, tenderness at the shot location, hair loss or undesired hair growth, abdominal pain, breast tenderness or acne. More serious but less common side effects include seizure, swelling in the legs or blot clots.
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