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