my doctor prescribed MERCILON. it was originally prescribed to me in order for my period to be regular (i used to be irregular kasi), but since i became sexually active i eventually used it din for contraceptive purposes. sone side effects i notice are the mood swings, irritability and depression a week before or during my period. i know most of us experience this condition known as PMS, but since i started taking my pills, my PMS worsened a hundred times!