All You Should About Contraceptive Coil to Avoid Pregnancy

All You Should About Contraceptive Coil to Avoid Pregnancy

Contraceptive coil is T-shaped plastic device that gets fitted in the vagina by your doctor. The coil provides protection for a long term against pregnancy.

Different types of contraceptive coil

  • The intrauterine system (IUS) – Also known as ‘hormonal coil’, this coil releases the hormone progesterone.
  • The intrauterine device (IUD) – This coil is coated with copper and also called a ‘copper coil’.

Advantages and disadvantages of contraceptive coils


  • IUDs works immediately once it gets fitted but this depends on your menstrual cycle
  • You do not need to consider contraception every time you enjoy sex
  • Most women can use them easily
  • It is quite possible to become pregnant once the contraceptive coil is removed
  • An IUD may be used for emergency contraception if it is fitted for almost 5 days after unprotected sex


  • They do not protect against STIs or sexually transmitted infections and so you should use other protection like condoms
  • If you have an infection with a coil, there are more chances of serious infection known as pelvic inflammatory disease
  • You will have to check regularly that your coil is in its place. Your doctor can help you learn how to do this
  • Your coil may either slip out of place or your womb might force it out. This is more likely to take place soon after a coil gets fitted.
  • Both kinds of coil may have some side effects

Advantages and disadvantages of an IUD


  • It usually lasts longer when compared to IUS
  • It will not interact with other medications
  • It does not cause any hormonal side effects
  • It works in the straightway, once it gets fitted
  • It can be used as emergency contraception for the first 5 days after you enjoy unprotected sex.


  • It might mean you will get painful or heavier periods
  • It may not be suitable if you have cancer of womb or cervical cancer and also if you have had one of these cancers earlier
  • It is not appropriate during copper allergy

Advantages and disadvantages of an IUS


  • It can make periods less painful or lighter
  • It may be used for treating heavy periods and endometriosis
  • This hormonal contraceptive can be used at the time of breastfeeding
  • It may be a suitable option in case you cannot take oestrogen which is a hormones in the contraceptive pill


  • Side effects such as acne, mood swings, breast tenderness usually disappear after the first 3 to 6 months.
  • There might be medical reasons why it is not safe to compare with the IUD, if you have had breast cancer
  • Some women find their periods become irregular or stop altogether which might not suit them

How to choose the right coil for you

The contraceptive coil you may choose will depend on your medical history, advice of your consultant gynaecologist and your own preference.

Some factors to consider are:

  • How long you want the coil to remain effective
  • Whether you can use hormonal contraception
  • Both coils should be more than 99% effective
  • If there are other conditions that the coil might help such as heavy periods or endometriosis

How effective the coil is

The best contraceptive coil is more than 99% effective in preventing pregnancy. After an IUD gets fitted, it works immediately but depends on where you are in your cycle.

Coils have the perfect use always which means once they are fitted properly, they provide maximum effectiveness. The only thing you have to do is check regularly that it is in proper place.

Contraceptives like pill are less effective when compared to coils. This is because people do not take them perfectly always. The only contraceptive with the perfect use like coil is contraceptive implant.

Gynae Clinic is a website designed to inform our patients about gynaecological services delivered at Medical Express Clinic at 117a Harley Street. In the event that patients are seen by a clinician, this will be arranged at Medical Express Clinic which is registered in the United Kingdom with the Care Quality Commission to provide healthcare services.