Hello, Thanks for trusting us with your health concern. The mini pill contains only progesterone and all the available brands contain the same preparation, norethindrone. The pill may be started from day one of the cycle or on the nearest Sunday,whichever is convenient. Before starting the medication, your wife needs to be evaluated if she is fit to receive it and there are no allergies to the medication and the tartrazine content in the preparation. Periodic evaluation to check the hepatic, coagulation and cardiovascular profile is necessary. Any breast masses must be reported immediately. The brand names Camila , Micronor or Norethindrone are some of the preparations available. Hope this helps.