Black couple. Image credit

Black couple. Image credit

ZIMSEC O Level Combined Science Notes:Contraception:Ways to prevent pregnancy

How it works



  • Is a small copper/plastic device placed inside the uterus
  • It prevents the embryo from implanting in the uterus
  • by changing the lining of the uterus
  • The chemical reaction caused by the IUD in the uterus also affects sperms
  • This prevents fertilisation


  • 97-98%


  • It is always in place once it is has been inserted
  • Does not interfere with the act of sex
  • It is reversible
  • No effect on breast feeding
  • Immediately effective


  • The insertion process requires a specialist
  • The device mall fall out
  • There is risk of infection
  • Increases chances of ectopic pregnancy (this leads to a miscarriages which can be fatal)
  • Some models have to be replaced by a medical professional every year
  • Can lead to increased menstrual bleeding and cramps

Side effects

  • Can lead to increased menstrual bleeding and cramps

To access more topics go to the Combined Science Notes page

Quick NetOne, Telecel, Africom, And Econet Airtime Recharge

If anything goes wrong, chat with us using the chat feature at the bottom right of this screen