Chemical contraceptives

Written by Dr David Delvin, GP and family planning specialist



Spermicides (that is, chemicals which destroy sperms) were still quite widely used in 2005. One advantage of these products is that you can buy them from any pharmacy without prescription. But these agents really shouldn't be employed on their own, because they're not effective enough. If you use them by themselves, there's a high chance that sperm will get through sometimes - and cause pregnancy.

So, all family planning experts agree that chemical contraception should only be used in combination with a 'barrier method' - such as a condom, diaphragm or a cap. The chemicals make these barrier methods more effective. In other words, fewer pregnancies will occur if you use a condom, diaphragm or cap with a spermicidal chemical. From time to time, manufacturers may suggest that these agents are so good that they can be used on their own! Don't pay any attention to these claims.

However, if you're both really desperate to make love, then a chemical contraceptive is certainly better than nothing at all.

How do chemical contraceptives work?

They mainly work by killing sperm inside the vagina. They do this because they contain a spermicide - that is, an agent which attacks sperm. The commonest spermicide used in these products is called nonoxinol-'9'.

How do you use them?

You put them into the vagina before intercourse. Either the woman or the man can do this. Some couples actually make it part of love play!

In the case of solid preparations (pessaries - see below), you must give them time (say, 30 minutes) to dissolve before you start having sex.

Follow the instructions on the leaflet in the package.

What types of chemical contraceptives are there?

There are various kinds and which one you choose is up to you. Generally people make their choice on the basis of what appeals to them aesthetically. For instance, one couple may prefer the feel, appearance and taste of foam, while others prefer the simplicity of a vaginal tablet.

The main types are as follows.

Foams These are in aerosol form and you insert them into the vagina with a special applicator, immediately before sex.

Vaginal tablets

These are also widely known as pessaries. In some books about sex, you may still find them referred to as 'suppositories'. This term has now been dropped - because most people understand the word 'suppository' to mean something put into the rectum. As they're solid, you must give them time (half an hour) to dissolve before you nake love.

Gels, jellies and creams

These are mainly intended for spreading onto contraceptive diaphragms or caps before insertion.

Films

Squares of contraceptive film are still marketed in some countries, though they have fallen out of favour in the UK. At one time, manufacturers suggested that the film should be put on the tip of the penis before the start of intercourse. This is very risky, and I do not recommend it! It will probably fall off.

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