Why it is advisable to take marvelon at evening each day?

Not sure about that: Marvelon and other birth control pills should be taken at the same time each day, to maintain steady hormone levels. Hormone levels may have dropped if a pill is taken hours later. A person should choose a particular time of day such that she is able to take the pill, and will remember to take it every day, whether it is in the morning, the afternoon, or the evening.