The term 'the pill' has become established in everyday language. The correct medical term is 'combined oral contraceptive', abbreviated COC.

When people talk about 'the pill' they usually mean the combined pill containing an estrogen and a progestin - the most commonly used form of oral contraception. Combined preparations containing particularly low hormone doses are called low-dose contraceptives.

The main mechanism of action of the pill is suppression of ovulation. But it also has other actions that help prevent conception.

The pill must be taken daily, always at the same time of day if possible, and there are certain rules that you must follow if you miss a pill. It is also possible to modify the usual pattern of tablet-taking in order to shift the date of your menstruation.

The pill has a number of positive side-effects over and above contraception. It can prevent the development of certain diseases and can cure diseases and relieve symptoms.

Today's COCs are very well tolerated. However, one should not forget that the COC is a highly potent drug which, like any drug, can have unwanted side-effects. There are also cases in which use of the pill is not allowed or not advised (contraindications) or only under special medical supervision.

And there are some things to remember about taking the pill when you travel.