Like all oral contraceptives, Levest has three levels of contraceptive effects which work together to prevent pregnancy
If you want to learn more about the details of how the pill works, please ask your healthcare provider for more information of visit any of the following websites for more information.
NHS Choices: guide to contraception
http://www.nhs.uk/Livewell/Contraception/Pages/Guidetocontraception.aspx
Patient UK Contraceptive Choices
http://www.patient.co.uk/health/Contraceptive-Choices.htm
The Family Planning Association Guide to Contraception
http://www.fpa.org.uk/Information/Readourinformationbooklets/guide
Contraception: Your Guide to the Combined Pill
http://www.fpa.org.uk/Information/Readourinformationbooklets/combined