The contraceptive patch (transdermal patch) is a form of hormonal contraception worn by a woman to stop her getting pregnant when she has sex.

Unlike barrier methods of contraception, such as condoms, the contraceptive patch does not protect against sexually transmitted infections (STIs).

How it works

The contraceptive patch is a small, thin, beige patch about 5cm by 5cm in size. You stick it onto your skin and it releases two hormones – oestrogen and progestogen – through your skin and into your bloodstream. These are the same hormones as those used in the combined oral contraceptive pill. The hormones prevent your ovaries releasing an egg (ovulation) and stop you from becoming pregnant.

The patch needs to be changed for a new one each week. Every fourth week, you have a patch-free week when you have a withdrawal bleed, like a period.

Contraceptive patches are available from your GP, local family planning clinic or sexual health (GUM) clinic. Not everyone can use the patch, so it is important to see a doctor or nurse who can check your medical and family history and make sure it is suitable for you (see Contraceptive patch – who can use it? for more information).

How effective is the contraceptive patch?

If used properly, the contraceptive patch is over 99% effective in preventing pregnancy. This means that if 100 women use the patch according to the instructions, less than one will get pregnant in a year.

Research has shown that the patch may be less effective for women who weigh 90kg (14 stone) or over.