The Shot

Depo-Provera, or the “depo shot,” is an injection containing progestin that’s administered by a nurse or doctor every three months. Common side effects include irregular bleeding and increased appetite.

 

How it works: The progestin inhibits ovulation and thickens the cervical mucus to block sperm from entering the uterus.

 

Cost: Up to $150

 

Rate of effectiveness: 94 percent