Multiphase contraceptive preparation based on natural estrogens

摘要

A multiphase contraceptive preparation comprises (a) a first phase of 2-4 daily dose units, each containing exclusively natural oestrogens as active agent, (b) a second phase of 22-16 daily dose units, each containing a combination of a least one natural oestrogen and at least one natural or synthetic gestagen as active agent, (c) a third phase of 2-4 daily unit doses, each containing exclusively natural oestrogens as active agent and (d) a further phase of 2-4 daily dose units, each comprising a pharmaceutically inactive placebo.