How good is it at preventing pregnancy?

A reasonably effective method, with only 6 in 100 women getting pregnant in the first year.

How it's used

A shot, usualy in the upper arm or hip

How often do I have to remember it

Every three months

Side Effects

• Can cause spotting or irregular periods, or no period at all
• Some women may feel sad or have decreased interest in sex
• May cause weight gain"

Benefits

• Can make your period go away completely
• Lowers your risk of ovarian and uterine cancer"