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

IUD
- 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
Effectiveness
- 97-98%
Advantages
- 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
Disadvantages
- 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
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