How long does Mercilon take to work?
If you start taking Mercilon within the first 5 days of starting your period, you will be protected from pregnancy straight away. At any other time in your menstrual cycle you will need to use
condoms or alternative contraception for the first 7 days before you are protected against pregnancy. If you are switching to the combined pill from another method, check out our blog on
changing your contraception.