Availability: Over the counter, no prescription needed
Cause of Failures:
- Not using it as directed
- Inserting it incorrectly
- Removing it too early
STI Prevention: None
Note: It is most effective for those who have not given birth. Some people have allergies to spermicide or to the sponge itself. There is a small risk of Toxic Shock Syndrome if the sponge is worn for longer than 24 hours.