The combined oral contraceptive pill (COCP) has been available in the UK since the early 1960s.

Since then it has gone through several incarnations. These are referred to as ‘generations’, of which there are four.

The main difference between them is the type of progesterone which is used. Whilst this may vary, the field of oestrogen hormones used is much smaller, with the most common of these being either ethinylestradiol or estradiol.

First Generation Pill

The first generation contraceptive pill had a higher concentration of the both oestrogen and progestin. The artificial versions of the hormone progesterone found in the first generation pills included norethynodrel, norethindrone, lynestrenol and ethynodiol diacetate.

The first generation pill was linked to some health scares that eventually lead to a change in the amount of hormones used. Newer pills use a lowered amount of both hormones. First generation pills are therefore no longer available in the UK.

Second Generation Pill

The next generation of pills came into use in the 1970s, and had a much lower amount of hormones. They contain progestins such as levonorgestrel and norethisterone. Lots of pills still prescribed today contain these ingredients.

Second generation pills your doctor may prescribe include Microgynon, Logynon and Loestrin.

Third Generation Pill

Around a decade after the release of second generation pills came third generation pills. This group of pills uses progestins such as norgestimate, desogestrel, gestodene and cyproterone acetate.

Third generation pills available on prescription in the UK include Cilest, Marvelon, Yasmin and Dianette.

Fourth Generation Pill

The most recent type of combined oral contraceptives contain the progestin called drospirenone.

Pills in this group include Zoely and Qlaira.

Which should I use?

There a lots of different brands of pill available to use, however they contain varying amounts of hormones and can therefore cause different side effects for different women.

For this reason if you are initially prescribed one type of oral contraceptive pill, which you find causes unwanted side effects; then it is highly likely that your doctor will suggest an alternative type of pill before they completely discount it as an option for you.

This is because making a slight change to the combination of the hormones may decrease any adverse effects whilst still offering the same high level of contraceptive protection.

Throughout the generations, the contraceptive pill has been linked to an increased chance of developing blood clots; but in recent years there have been various media stories suggesting that newer forms of contraceptive pill are more dangerous than their second generation counterparts.

According to the Medicines and Healthcare Products Regulatory Agency (MHRA) throughout the course of one year an average of two healthy women out of 10,000 go on to develop a blood clot. When a combined oral contraceptive of any type is in use this number increases to between five and twelve women out of 10,000.

Family history and past medical history might put someone at higher risk of developing a blood clot, and both factors are taken into consideration by the prescribing clinician before a decision is made on the suitability of the medication.

The contraceptive pills currently available have been deemed very safe for use and women should feel confident in their decision to take them.

If this article has raised any questions about your pill and its side effects then you should arrange to speak to your doctor.