A hormone blocker (or interferer) is a broad range of drugs and enzymes, typically what they do is interfere with the process of your native hormone production, or they disable the receptors in your body which the hormones bind to. Hormones work like keys, they fit into locks in your cells.sing birth control pills as a way to stop your period is not a good idea...it will most certainly lead to female pattern weight gain in areas you do not want it...on the other hand you have also to be careful with estrogen blockers as they remove all estrogen and you need SOME for bone health, hair and libido...