What it is?

A flexible rubber or silicone dome-shaped device which is used with spermicide. It is placed in the vagina to cover the cervix each time a woman has sex.

How it works?

Stops sperm from entering the womb.

Advantages

May protect against some sexually transmitted infections (STIs) and cancer of the cervix. Only needs to be used when having sex. Can be put in before sex.

Disadvantages

Putting it in can interrupt sex. Must be fitted by a doctor or nurse in the first place to make sure it's the right size. Can cause cystitis.

How effective is it?

92-96% effective if used properly. This means that between 4 and 8 women in every 100 who use the cap or diaphragm will get pregnant each year.

What makes it less effective?

It must be left in for 8 hours after having sex. Need to use more spermicide if have sex again, or more than three hours after putting it in. If the woman gains or loses more than 7lbs in weight, has a baby, or has a miscarriage, or an abortion, the fitting of the diaphragm/cap should be checked by a doctor or nurse to ensure that it still fits.

Can anyone use this method?

Diaphragms/caps are suitable for most women. Some women are allergic to rubber or spermicides or may have other conditions which prevent a diaphragm or cap being used.

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