What Causes Menstruation Cycle Only On Taking Medications?

Hello dr, I have a period problem last 4 yr ....i have no menses without tablet but last 1 yrs i can t use any tablet for menses,&last mnth i use period tablet but no period comes.my dr refer me duoluton l last yr...and me and my husband think that we start duoluton l for menses is it really work for my problem and i also think for come menses imidiately use prominent n for 10 days....