Corpus ID: 11591389

[Ovanon, a new sequential oral contraceptive. Preliminary report].

  title={[Ovanon, a new sequential oral contraceptive. Preliminary report].},
  author={J. Gorodovsky and A. Pe{\~n}a and E. Rice-wray},
  journal={Ginecologia y obstetricia de Mexico},
  volume={26 157},
Sequential oral contraceptives have the reputation of not being as effective as combined preparations because the estrogen administered during the 1st 15 days creates a favorable sperm environment in the cervical mucus as opposed to the hostile environment created by the progestagen in combined pills. The study was undertaken in an effort to develop a sequential that would create a hostile cervical environment during the middle of the cycle by administering the progestagen earlier on. The… Expand

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