Diaphragm/Cap

Diaphragm/cap with spermicide

Effectiveness:
Latex types are 92–96 per cent effective if used correctly. Between four and eight women in 100 will get pregnant in a year. Silicone caps are less effective.

How it works:
A flexible latex (rubber) or silicone device, used with spermicide, is put into the vagina to cover the cervix. This stops sperm from entering the uterus and meeting an egg.

Advantages:
• Can be put in any time before sex.
• May protect against some sexually transmitted infections and cancer of the cervix.
• A variety of types to choose from.
• No serious health risks.

Disadvantages:
• Putting it in can interrupt sex.
• Extra spermicide is needed if you have sex again.
• Cystitis can be a problem for some diaphragm users.
• Can take time to learn how to use correctly.

Comments:
• Correct size needs to be known and you need to replace it if you gain or lose more than 3kg (seven pounds), have a baby, miscarriage or abortion.

NHS Choices