Contraception: Preventing Pregnancy

Thanks to contraceptive methods, couples can have sexual relations without fearing an unwanted pregnancy

Anticoncepción: la prevención del embarazo

What is contraception?

Contraception seeks to prevent pregnancy by means of methods that are transitory and allow fertility to be restored after stopping them. In contrast, sterilisation is a permanent method to prevent pregnancy. 

There are different contraceptive methods, and each woman, having been introduced to them, must choose the one that suits her best under her doctor’s guidance.

Types of contraception: Natural and artificial

Artificial contraceptive methods prevent sperm from fertilizing the egg by means of a physical device or a barrier. Natural contraceptive methods are based on sexual abstinence during the fertile days of each cycle. Four methods can be distinguished according to the natural technique used: the rhythm method, the basal body temperature method, the cervical mucus method (also known as “the Billings ovulation method”) and the syntothermic method.



  • Barrier methods

They prevent sperm from passing through to the uterus. This group includes male and female condoms, diaphragms, spermicide creams, and so on.

  • Hormonal methods: the pill, patches and the vaginal ring 

These medications are composed of two different hormones: estrogens and gestagens. They alter the normal functioning of the ovaries to prevent ovulation as well as some other functions of the female reproductive system. 

The pharmaceutical drugs used have been changed since hormonal contraceptive methods were first introduced. Dosage, appearance, directions and administration have all been changed so as to minimise their harmful side effects.


    • Contraceptive pills are packaged in packs of 21 (28 in others) where each pill is marked with one day of the week as a reminder to ensure that you take one every day. Because pills should be taken around the same time for three weeks, you have to take a break for a week, starting a new pack at the beginning of the following week. You should have your period during the break week. If the pack has 28 pills, you should not stop taking them, as you will also have your period during the fourth week, which is placebo week.
    • Contraceptive patches, which resemble a square bandage, are applied on clean, dry, hairless skin (except on the chest area). Medication is administered through the skin. It consists of three patches that are applied weekly. When you have removed the third patch, you have to take a break for a week, starting again the following week. You should have your period during the break week. You should check every day that the patch is well adhered to your skin.
    • Vaginal rings are transparent plastic rings that can be easily inserted into the vagina. Medication is administered through the vaginal mucus. You have to insert it once a month, remove it after three weeks and take a break on the fourth week, which is when you will have your period. It does not cause discomfort during sex. 

All these methods are safe, provided that the guidelines are followed. A comprehensive medical examination should be performed before starting to use them. After the examination, further information (advantages and disadvantages) about the selected method is provided.

  • Intrauterine methods: Essure, copper IUD and hormonal IUD 

The intrauterine device (IUD) is a small plastic or copper device that the gynecologist placed inside the uterus. Prevents progression of sperm and / or endometrial produce aseptic inflammation would prevent a settlement of the yolk sac.

Some IUDs release small amounts of progestin. IUDs may be left in place for 5-10 years depending on the type of device used. IUDs can be placed at almost any time but preferably during menstruation.

Sterilization: Essure, tubal ligation and vasectomy


An essure is a 40 millimetres long by 8 millimetres wide implant that is placed in the proximal section of the Fallopian tubes by means of a hysteroscopy. It is made from Nitinol (a nickel-titanium alloy) and polyethylene fibres, causing fibrosis and occlusion in the tubes after 3 months, thus preventing fertilization.

Nowadays, its placement does not require anaesthesia and is performed on an outpatient basis, with the aid of hysteroscopy.

A simple pelvic X-ray, a hysterosalpingography, a hysterosonography or a 2D or 3D ultrasound scan can be used to confirm tubal occlusion.

It is a safe method, well tolerated by patients, effective over time, irreversible, more cost-effective than tubal ligation and compatible with In Vitro Fertilisation if it becomes necessary.

Tubal ligation

It involves electrocoagulation and/or incision of both Fallopian tubes, thus preventing the eggs from passing through the tubes to meet the sperm. It is performed by laparoscopy and requires general anaesthesia and a few hours hospitalisation. Sometimes it is performed at the time of a caesarean section.


The vasa deferentia, which carry sperm out of the testicles, are cut. It is performed under regional anaesthesia on an outpatient basis and lasts from 15 to 30 minutes. It is not immediately effective. A spermiogram is required to check that no sperm remain in the ejaculate after a number of times.

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