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Les antagonistes agissent par inhibition compétitive des récepteurs hypophysaires de la GnRH pour lesquels ils ont une affinité importante avec une activité dose dépendante. L'inhibition porte sur la LH mais aussi sur la FSH en annulant leur sécrétion en 24 heures.Actuellement, trois molécules seulement sont disponibles. Le cétrorélix est surtout utilisé dans les protocoles de fécondation in vitro,...
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