Thanks for the query.
Both the tablets contain ethinylestradiol
The quantity of the drugs in also almost same.
So you can use Marvelon
instead of Mercilon
You have to use it regularly as per the schedule to get complete protection.
The side effects like nausea, bloating sensation etc can be seen like any other contraceptive
pills. But as you didn't have any problem with Mercilon you may not have problem with Marvelon also.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429